Initial revision

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@102074 138bc75d-0d04-0410-961f-82ee72b054a4

25 files changed, 4484 insertions, 0 deletions

diff --git a/libjava/classpath/gnu/regexp/CharIndexed.java b/libjava/classpath/gnu/regexp/CharIndexed.java
new file mode 100644
index 00000000000..a0d7106aefa
--- /dev/null
+++ b/libjava/classpath/gnu/regexp/CharIndexed.java
@@ -0,0 +1,84 @@
+/* gnu/regexp/CharIndexed.java
+   Copyright (C) 1998-2001, 2004 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+package gnu.regexp;
+
+/**
+ * Defines the interface used internally so that different types of source
+ * text can be accessed in the same way.  Built-in concrete classes provide
+ * support for String, StringBuffer, InputStream and char[] types.
+ * A class that is CharIndexed supports the notion of a cursor within a
+ * block of text.  The cursor must be able to be advanced via the move()
+ * method.  The charAt() method returns the character at the cursor position
+ * plus a given offset.
+ *
+ * @author <A HREF="mailto:wes@cacas.org">Wes Biggs</A>
+ */
+public interface CharIndexed {
+    /**
+     * Defines a constant (0xFFFF was somewhat arbitrarily chosen)
+     * that can be returned by the charAt() function indicating that
+     * the specified index is out of range.
+     */
+    char OUT_OF_BOUNDS = '\uFFFF';
+
+    /**
+     * Returns the character at the given offset past the current cursor
+     * position in the input.  The index of the current position is zero.
+     * It is possible for this method to be called with a negative index.
+     * This happens when using the '^' operator in multiline matching mode
+     * or the '\b' or '\<' word boundary operators.  In any case, the lower
+     * bound is currently fixed at -2 (for '^' with a two-character newline).
+     *
+     * @param index the offset position in the character field to examine
+     * @return the character at the specified index, or the OUT_OF_BOUNDS
+     *   character defined by this interface.
+     */
+    char charAt(int index);
+
+    /**
+     * Shifts the input buffer by a given number of positions.  Returns
+     * true if the new cursor position is valid.
+     */
+    boolean move(int index);
+
+    /**
+     * Returns true if the most recent move() operation placed the cursor
+     * position at a valid position in the input.
+     */
+    boolean isValid();
+}
diff --git a/libjava/classpath/gnu/regexp/CharIndexedCharArray.java b/libjava/classpath/gnu/regexp/CharIndexedCharArray.java
new file mode 100644
index 00000000000..63d858c8709
--- /dev/null
+++ b/libjava/classpath/gnu/regexp/CharIndexedCharArray.java
@@ -0,0 +1,62 @@
+/* gnu/regexp/CharIndexedCharArray.java
+   Copyright (C) 1998-2001, 2004 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+package gnu.regexp;
+import java.io.Serializable;
+
+class CharIndexedCharArray implements CharIndexed, Serializable {
+    private char[] s;
+    private int anchor;
+    
+    CharIndexedCharArray(char[] str, int index) {
+	s = str;
+	anchor = index;
+    }
+    
+    public char charAt(int index) {
+	int pos = anchor + index;
+	return ((pos < s.length) && (pos >= 0)) ? s[pos] : OUT_OF_BOUNDS;
+    }
+    
+    public boolean isValid() {
+	return (anchor < s.length);
+    }
+    
+    public boolean move(int index) {
+	return ((anchor += index) < s.length);
+    }
+}
diff --git a/libjava/classpath/gnu/regexp/CharIndexedInputStream.java b/libjava/classpath/gnu/regexp/CharIndexedInputStream.java
new file mode 100644
index 00000000000..145fe11b135
--- /dev/null
+++ b/libjava/classpath/gnu/regexp/CharIndexedInputStream.java
@@ -0,0 +1,149 @@
+/* gnu/regexp/CharIndexedInputStream.java
+   Copyright (C) 1998-2001, 2004 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+package gnu.regexp;
+import java.io.BufferedInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+
+// TODO: move(x) shouldn't rely on calling next() x times
+
+class CharIndexedInputStream implements CharIndexed {
+    private static final int BUFFER_INCREMENT = 1024;
+    private static final int UNKNOWN = Integer.MAX_VALUE; // value for end
+    
+    private BufferedInputStream br;
+
+    // so that we don't try to reset() right away
+    private int index = -1;
+
+    private int bufsize = BUFFER_INCREMENT;
+
+    private int end = UNKNOWN;
+
+    private char cached = OUT_OF_BOUNDS;
+
+    // Big enough for a \r\n pair
+    // lookBehind[0] = most recent
+    // lookBehind[1] = second most recent
+    private char[] lookBehind = new char[] { OUT_OF_BOUNDS, OUT_OF_BOUNDS }; 
+    
+    CharIndexedInputStream(InputStream str, int index) {
+	if (str instanceof BufferedInputStream) br = (BufferedInputStream) str;
+	else br = new BufferedInputStream(str,BUFFER_INCREMENT);
+	next();
+	if (index > 0) move(index);
+    }
+    
+    private boolean next() {
+	if (end == 1) return false;
+	end--; // closer to end
+
+	try {
+	    if (index != -1) {
+		br.reset();
+	    }
+	    int i = br.read();
+	    br.mark(bufsize);
+	    if (i == -1) {
+		end = 1;
+		cached = OUT_OF_BOUNDS;
+		return false;
+	    }
+	    cached = (char) i;
+	    index = 1;
+	} catch (IOException e) { 
+	    e.printStackTrace();
+	    cached = OUT_OF_BOUNDS;
+	    return false; 
+	}
+	return true;
+    }
+    
+    public char charAt(int index) {
+	if (index == 0) {
+	    return cached;
+	} else if (index >= end) {
+	    return OUT_OF_BOUNDS;
+	} else if (index == -1) {
+	    return lookBehind[0];
+	} else if (index == -2) {
+	    return lookBehind[1];
+	} else if (index < -2) {
+	    return OUT_OF_BOUNDS;
+	} else if (index >= bufsize) {
+	    // Allocate more space in the buffer.
+	    try {
+		while (bufsize <= index) bufsize += BUFFER_INCREMENT;
+		br.reset();
+		br.mark(bufsize);
+		br.skip(index-1);
+	    } catch (IOException e) { }
+	} else if (this.index != index) {
+	    try {
+		br.reset();
+		br.skip(index-1);
+	    } catch (IOException e) { }
+	}
+	char ch = OUT_OF_BOUNDS;
+	
+	try {
+	    int i = br.read();
+	    this.index = index+1; // this.index is index of next pos relative to charAt(0)
+	    if (i == -1) {
+		// set flag that next should fail next time?
+		end = index;
+		return ch;
+	    }
+	    ch = (char) i;
+	} catch (IOException ie) { }
+	
+	return ch;
+    }
+    
+    public boolean move(int index) {
+	// move read position [index] clicks from 'charAt(0)'
+	boolean retval = true;
+	while (retval && (index-- > 0)) retval = next();
+	return retval;
+    }
+    
+    public boolean isValid() {
+	return (cached != OUT_OF_BOUNDS);
+    }
+}
+
diff --git a/libjava/classpath/gnu/regexp/CharIndexedString.java b/libjava/classpath/gnu/regexp/CharIndexedString.java
new file mode 100644
index 00000000000..05be07ac68c
--- /dev/null
+++ b/libjava/classpath/gnu/regexp/CharIndexedString.java
@@ -0,0 +1,64 @@
+/* gnu/regexp/CharIndexedString.java
+   Copyright (C) 1998-2001, 2004 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+package gnu.regexp;
+import java.io.Serializable;
+
+class CharIndexedString implements CharIndexed, Serializable {
+    private String s;
+    private int anchor;
+    private int len;
+    
+    CharIndexedString(String str, int index) {
+	s = str;
+	len = s.length();
+	anchor = index;
+    }
+
+    public char charAt(int index) {
+	int pos = anchor + index;
+	return ((pos < len) && (pos >= 0)) ? s.charAt(pos) : OUT_OF_BOUNDS;
+    }
+    
+    public boolean isValid() {
+	return (anchor < len);
+    }
+    
+    public boolean move(int index) {
+	return ((anchor += index) < len);
+    }
+}
diff --git a/libjava/classpath/gnu/regexp/CharIndexedStringBuffer.java b/libjava/classpath/gnu/regexp/CharIndexedStringBuffer.java
new file mode 100644
index 00000000000..1b88e398571
--- /dev/null
+++ b/libjava/classpath/gnu/regexp/CharIndexedStringBuffer.java
@@ -0,0 +1,62 @@
+/* gnu/regexp/CharIndexedStringBuffer.java
+   Copyright (C) 1998-2001, 2004 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+package gnu.regexp;
+import java.io.Serializable;
+
+class CharIndexedStringBuffer implements CharIndexed, Serializable {
+    private StringBuffer s;
+    private int anchor;
+
+    CharIndexedStringBuffer(StringBuffer str, int index) {
+	s = str;
+	anchor = index;
+    }
+
+  public char charAt(int index) {
+      int pos = anchor + index;
+    return ((pos < s.length()) && (pos >= 0)) ? s.charAt(pos) : OUT_OF_BOUNDS;
+  }
+
+  public boolean isValid() {
+    return (anchor < s.length());
+  }
+
+  public boolean move(int index) {
+    return ((anchor += index) < s.length());
+  }
+}
diff --git a/libjava/classpath/gnu/regexp/RE.java b/libjava/classpath/gnu/regexp/RE.java
new file mode 100644
index 00000000000..16427c7566d
--- /dev/null
+++ b/libjava/classpath/gnu/regexp/RE.java
@@ -0,0 +1,1396 @@
+/* gnu/regexp/RE.java
+   Copyright (C) 1998-2001, 2004, 2005 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+package gnu.regexp;
+import java.io.InputStream;
+import java.io.Serializable;
+import java.util.Locale;
+import java.util.PropertyResourceBundle;
+import java.util.ResourceBundle;
+import java.util.Vector;
+
+/**
+ * RE provides the user interface for compiling and matching regular
+ * expressions.
+ * <P>
+ * A regular expression object (class RE) is compiled by constructing it
+ * from a String, StringBuffer or character array, with optional 
+ * compilation flags (below)
+ * and an optional syntax specification (see RESyntax; if not specified,
+ * <code>RESyntax.RE_SYNTAX_PERL5</code> is used).
+ * <P>
+ * Once compiled, a regular expression object is reusable as well as
+ * threadsafe: multiple threads can use the RE instance simultaneously
+ * to match against different input text.
+ * <P>
+ * Various methods attempt to match input text against a compiled
+ * regular expression.  These methods are:
+ * <LI><code>isMatch</code>: returns true if the input text in its
+ * entirety matches the regular expression pattern.
+ * <LI><code>getMatch</code>: returns the first match found in the
+ * input text, or null if no match is found.
+ * <LI><code>getAllMatches</code>: returns an array of all
+ * non-overlapping matches found in the input text.  If no matches are
+ * found, the array is zero-length.
+ * <LI><code>substitute</code>: substitute the first occurence of the
+ * pattern in the input text with a replacement string (which may
+ * include metacharacters $0-$9, see REMatch.substituteInto).
+ * <LI><code>substituteAll</code>: same as above, but repeat for each
+ * match before returning.
+ * <LI><code>getMatchEnumeration</code>: returns an REMatchEnumeration
+ * object that allows iteration over the matches (see
+ * REMatchEnumeration for some reasons why you may want to do this
+ * instead of using <code>getAllMatches</code>.
+ * <P>
+ *
+ * These methods all have similar argument lists.  The input can be a
+ * String, a character array, a StringBuffer, or an
+ * InputStream of some sort.  Note that when using an
+ * InputStream, the stream read position cannot be guaranteed after
+ * attempting a match (this is not a bug, but a consequence of the way
+ * regular expressions work).  Using an REMatchEnumeration can
+ * eliminate most positioning problems.
+ *
+ * <P>
+ *
+ * The optional index argument specifies the offset from the beginning
+ * of the text at which the search should start (see the descriptions
+ * of some of the execution flags for how this can affect positional
+ * pattern operators).  For an InputStream, this means an
+ * offset from the current read position, so subsequent calls with the
+ * same index argument on an InputStream will not
+ * necessarily access the same position on the stream, whereas
+ * repeated searches at a given index in a fixed string will return
+ * consistent results.
+ *
+ * <P>
+ * You can optionally affect the execution environment by using a
+ * combination of execution flags (constants listed below).
+ * 
+ * <P>
+ * All operations on a regular expression are performed in a
+ * thread-safe manner.
+ *
+ * @author <A HREF="mailto:wes@cacas.org">Wes Biggs</A>
+ * @version 1.1.5-dev, to be released
+ */
+
+public class RE extends REToken {
+
+  private static final class IntPair implements Serializable {
+    public int first, second;
+  }
+
+  private static final class CharUnit implements Serializable {
+    public char ch;
+    public boolean bk;
+  }
+
+  // This String will be returned by getVersion()
+  private static final String VERSION = "1.1.5-dev";
+
+  // The localized strings are kept in a separate file
+  private static ResourceBundle messages = PropertyResourceBundle.getBundle("gnu/regexp/MessagesBundle", Locale.getDefault());
+
+  // These are, respectively, the first and last tokens in our linked list
+  // If there is only one token, firstToken == lastToken
+  private REToken firstToken, lastToken;
+
+  // This is the number of subexpressions in this regular expression,
+  // with a minimum value of zero.  Returned by getNumSubs()
+  private int numSubs;
+
+    /** Minimum length, in characters, of any possible match. */
+    private int minimumLength;
+
+  /**
+   * Compilation flag. Do  not  differentiate  case.   Subsequent
+   * searches  using  this  RE will be case insensitive.
+   */
+  public static final int REG_ICASE = 2;
+
+  /**
+   * Compilation flag. The match-any-character operator (dot)
+   * will match a newline character.  When set this overrides the syntax
+   * bit RE_DOT_NEWLINE (see RESyntax for details).  This is equivalent to
+   * the "/s" operator in Perl.
+   */
+  public static final int REG_DOT_NEWLINE = 4;
+
+  /**
+   * Compilation flag. Use multiline mode.  In this mode, the ^ and $
+   * anchors will match based on newlines within the input. This is
+   * equivalent to the "/m" operator in Perl.
+   */
+  public static final int REG_MULTILINE = 8;
+
+  /**
+   * Execution flag.
+   * The match-beginning operator (^) will not match at the beginning
+   * of the input string. Useful for matching on a substring when you
+   * know the context of the input is such that position zero of the
+   * input to the match test is not actually position zero of the text.
+   * <P>
+   * This example demonstrates the results of various ways of matching on
+   * a substring.
+   * <P>
+   * <CODE>
+   * String s = "food bar fool";<BR>
+   * RE exp = new RE("^foo.");<BR>
+   * REMatch m0 = exp.getMatch(s);<BR>
+   * REMatch m1 = exp.getMatch(s.substring(8));<BR>
+   * REMatch m2 = exp.getMatch(s.substring(8),0,RE.REG_NOTBOL); <BR>
+   * REMatch m3 = exp.getMatch(s,8);                            <BR>
+   * REMatch m4 = exp.getMatch(s,8,RE.REG_ANCHORINDEX);         <BR>
+   * <P>
+   * // Results:<BR>
+   * //  m0.toString(): "food"<BR>
+   * //  m1.toString(): "fool"<BR>
+   * //  m2.toString(): null<BR>
+   * //  m3.toString(): null<BR>
+   * //  m4.toString(): "fool"<BR>
+   * </CODE>
+   */
+  public static final int REG_NOTBOL = 16;
+
+  /**
+   * Execution flag.
+   * The match-end operator ($) does not match at the end
+   * of the input string. Useful for matching on substrings.
+   */
+  public static final int REG_NOTEOL = 32;
+
+  /**
+   * Execution flag.
+   * When a match method is invoked that starts matching at a non-zero
+   * index into the input, treat the input as if it begins at the index
+   * given.  The effect of this flag is that the engine does not "see"
+   * any text in the input before the given index.  This is useful so
+   * that the match-beginning operator (^) matches not at position 0
+   * in the input string, but at the position the search started at
+   * (based on the index input given to the getMatch function).  See
+   * the example under REG_NOTBOL.  It also affects the use of the \&lt;
+   * and \b operators.
+   */
+  public static final int REG_ANCHORINDEX = 64;
+
+  /**
+   * Execution flag.
+   * The substitute and substituteAll methods will not attempt to
+   * interpolate occurrences of $1-$9 in the replacement text with
+   * the corresponding subexpressions.  For example, you may want to
+   * replace all matches of "one dollar" with "$1".
+   */
+  public static final int REG_NO_INTERPOLATE = 128;
+
+  /** Returns a string representing the version of the gnu.regexp package. */
+  public static final String version() {
+    return VERSION;
+  }
+
+  // Retrieves a message from the ResourceBundle
+  static final String getLocalizedMessage(String key) {
+    return messages.getString(key);
+  }
+
+  /**
+   * Constructs a regular expression pattern buffer without any compilation
+   * flags set, and using the default syntax (RESyntax.RE_SYNTAX_PERL5).
+   *
+   * @param pattern A regular expression pattern, in the form of a String,
+   *   StringBuffer or char[].  Other input types will be converted to
+   *   strings using the toString() method.
+   * @exception REException The input pattern could not be parsed.
+   * @exception NullPointerException The pattern was null.
+   */
+  public RE(Object pattern) throws REException {
+    this(pattern,0,RESyntax.RE_SYNTAX_PERL5,0,0);
+  }
+
+  /**
+   * Constructs a regular expression pattern buffer using the specified
+   * compilation flags and the default syntax (RESyntax.RE_SYNTAX_PERL5).
+   *
+   * @param pattern A regular expression pattern, in the form of a String,
+   *   StringBuffer, or char[].  Other input types will be converted to
+   *   strings using the toString() method.
+   * @param cflags The logical OR of any combination of the compilation flags listed above.
+   * @exception REException The input pattern could not be parsed.
+   * @exception NullPointerException The pattern was null.
+   */
+  public RE(Object pattern, int cflags) throws REException {
+    this(pattern,cflags,RESyntax.RE_SYNTAX_PERL5,0,0);
+  }
+
+  /**
+   * Constructs a regular expression pattern buffer using the specified
+   * compilation flags and regular expression syntax.
+   *
+   * @param pattern A regular expression pattern, in the form of a String,
+   *   StringBuffer, or char[].  Other input types will be converted to
+   *   strings using the toString() method.
+   * @param cflags The logical OR of any combination of the compilation flags listed above.
+   * @param syntax The type of regular expression syntax to use.
+   * @exception REException The input pattern could not be parsed.
+   * @exception NullPointerException The pattern was null.
+   */
+  public RE(Object pattern, int cflags, RESyntax syntax) throws REException {
+    this(pattern,cflags,syntax,0,0);
+  }
+
+  // internal constructor used for alternation
+  private RE(REToken first, REToken last,int subs, int subIndex, int minLength) {
+    super(subIndex);
+    firstToken = first;
+    lastToken = last;
+    numSubs = subs;
+    minimumLength = minLength;
+    addToken(new RETokenEndSub(subIndex));
+  }
+
+  private RE(Object patternObj, int cflags, RESyntax syntax, int myIndex, int nextSub) throws REException {
+    super(myIndex); // Subexpression index of this token.
+    initialize(patternObj, cflags, syntax, myIndex, nextSub);
+  }
+
+    // For use by subclasses
+    protected RE() { super(0); }
+
+    // The meat of construction
+  protected void initialize(Object patternObj, int cflags, RESyntax syntax, int myIndex, int nextSub) throws REException {
+      char[] pattern;
+    if (patternObj instanceof String) {
+      pattern = ((String) patternObj).toCharArray();
+    } else if (patternObj instanceof char[]) {
+      pattern = (char[]) patternObj;
+    } else if (patternObj instanceof StringBuffer) {
+      pattern = new char [((StringBuffer) patternObj).length()];
+      ((StringBuffer) patternObj).getChars(0,pattern.length,pattern,0);
+    } else {
+	pattern = patternObj.toString().toCharArray();
+    }
+
+    int pLength = pattern.length;
+
+    numSubs = 0; // Number of subexpressions in this token.
+    Vector branches = null;
+
+    // linked list of tokens (sort of -- some closed loops can exist)
+    firstToken = lastToken = null;
+
+    // Precalculate these so we don't pay for the math every time we
+    // need to access them.
+    boolean insens = ((cflags & REG_ICASE) > 0);
+
+    // Parse pattern into tokens.  Does anyone know if it's more efficient
+    // to use char[] than a String.charAt()?  I'm assuming so.
+
+    // index tracks the position in the char array
+    int index = 0;
+
+    // this will be the current parse character (pattern[index])
+    CharUnit unit = new CharUnit();
+
+    // This is used for {x,y} calculations
+    IntPair minMax = new IntPair();
+
+    // Buffer a token so we can create a TokenRepeated, etc.
+    REToken currentToken = null;
+    char ch;
+    boolean quot = false;
+
+    while (index < pLength) {
+      // read the next character unit (including backslash escapes)
+      index = getCharUnit(pattern,index,unit,quot);
+
+      if (unit.bk)
+        if (unit.ch == 'Q') {
+          quot = true;
+          continue;
+        } else if (unit.ch == 'E') {
+          quot = false;
+          continue;
+        }
+      if (quot)
+      	unit.bk = false;
+
+      // ALTERNATION OPERATOR
+      //  \| or | (if RE_NO_BK_VBAR) or newline (if RE_NEWLINE_ALT)
+      //  not available if RE_LIMITED_OPS is set
+
+      // TODO: the '\n' literal here should be a test against REToken.newline,
+      // which unfortunately may be more than a single character.
+      if ( ( (unit.ch == '|' && (syntax.get(RESyntax.RE_NO_BK_VBAR) ^ (unit.bk || quot)))
+	     || (syntax.get(RESyntax.RE_NEWLINE_ALT) && (unit.ch == '\n') && !(unit.bk || quot)) )
+	   && !syntax.get(RESyntax.RE_LIMITED_OPS)) {
+	// make everything up to here be a branch. create vector if nec.
+	addToken(currentToken);
+	RE theBranch = new RE(firstToken, lastToken, numSubs, subIndex, minimumLength);
+	minimumLength = 0;
+	if (branches == null) {
+	    branches = new Vector();
+	}
+	branches.addElement(theBranch);
+	firstToken = lastToken = currentToken = null;
+      }
+      
+      // INTERVAL OPERATOR:
+      //  {x} | {x,} | {x,y}  (RE_INTERVALS && RE_NO_BK_BRACES)
+      //  \{x\} | \{x,\} | \{x,y\} (RE_INTERVALS && !RE_NO_BK_BRACES)
+      //
+      // OPEN QUESTION: 
+      //  what is proper interpretation of '{' at start of string?
+
+      else if ((unit.ch == '{') && syntax.get(RESyntax.RE_INTERVALS) && (syntax.get(RESyntax.RE_NO_BK_BRACES) ^ (unit.bk || quot))) {
+	int newIndex = getMinMax(pattern,index,minMax,syntax);
+        if (newIndex > index) {
+          if (minMax.first > minMax.second)
+            throw new REException(getLocalizedMessage("interval.order"),REException.REG_BADRPT,newIndex);
+          if (currentToken == null)
+            throw new REException(getLocalizedMessage("repeat.no.token"),REException.REG_BADRPT,newIndex);
+          if (currentToken instanceof RETokenRepeated) 
+            throw new REException(getLocalizedMessage("repeat.chained"),REException.REG_BADRPT,newIndex);
+          if (currentToken instanceof RETokenWordBoundary || currentToken instanceof RETokenWordBoundary)
+            throw new REException(getLocalizedMessage("repeat.assertion"),REException.REG_BADRPT,newIndex);
+          if ((currentToken.getMinimumLength() == 0) && (minMax.second == Integer.MAX_VALUE))
+            throw new REException(getLocalizedMessage("repeat.empty.token"),REException.REG_BADRPT,newIndex);
+          index = newIndex;
+          currentToken = setRepeated(currentToken,minMax.first,minMax.second,index); 
+        }
+        else {
+          addToken(currentToken);
+          currentToken = new RETokenChar(subIndex,unit.ch,insens);
+        } 
+      }
+      
+      // LIST OPERATOR:
+      //  [...] | [^...]
+
+      else if ((unit.ch == '[') && !(unit.bk || quot)) {
+	Vector options = new Vector();
+	boolean negative = false;
+	char lastChar = 0;
+	if (index == pLength) throw new REException(getLocalizedMessage("unmatched.bracket"),REException.REG_EBRACK,index);
+	
+	// Check for initial caret, negation
+	if ((ch = pattern[index]) == '^') {
+	  negative = true;
+	  if (++index == pLength) throw new REException(getLocalizedMessage("class.no.end"),REException.REG_EBRACK,index);
+	  ch = pattern[index];
+	}
+
+	// Check for leading right bracket literal
+	if (ch == ']') {
+	  lastChar = ch;
+	  if (++index == pLength) throw new REException(getLocalizedMessage("class.no.end"),REException.REG_EBRACK,index);
+	}
+
+	while ((ch = pattern[index++]) != ']') {
+	  if ((ch == '-') && (lastChar != 0)) {
+	    if (index == pLength) throw new REException(getLocalizedMessage("class.no.end"),REException.REG_EBRACK,index);
+	    if ((ch = pattern[index]) == ']') {
+	      options.addElement(new RETokenChar(subIndex,lastChar,insens));
+	      lastChar = '-';
+	    } else {
+	      options.addElement(new RETokenRange(subIndex,lastChar,ch,insens));
+	      lastChar = 0;
+	      index++;
+	    }
+          } else if ((ch == '\\') && syntax.get(RESyntax.RE_BACKSLASH_ESCAPE_IN_LISTS)) {
+            if (index == pLength) throw new REException(getLocalizedMessage("class.no.end"),REException.REG_EBRACK,index);
+	    int posixID = -1;
+	    boolean negate = false;
+            char asciiEsc = 0;
+	    if (("dswDSW".indexOf(pattern[index]) != -1) && syntax.get(RESyntax.RE_CHAR_CLASS_ESC_IN_LISTS)) {
+	      switch (pattern[index]) {
+	      case 'D':
+		negate = true;
+	      case 'd':
+		posixID = RETokenPOSIX.DIGIT;
+		break;
+	      case 'S':
+		negate = true;
+	      case 's':
+		posixID = RETokenPOSIX.SPACE;
+		break;
+	      case 'W':
+		negate = true;
+	      case 'w':
+		posixID = RETokenPOSIX.ALNUM;
+		break;
+	      }
+	    }
+            else if ("nrt".indexOf(pattern[index]) != -1) {
+              switch (pattern[index]) {
+                case 'n':
+                  asciiEsc = '\n';
+                  break;
+                case 't':
+                  asciiEsc = '\t';
+                  break;
+                case 'r':
+                  asciiEsc = '\r';
+                  break;
+              }
+            }
+	    if (lastChar != 0) options.addElement(new RETokenChar(subIndex,lastChar,insens));
+	    
+	    if (posixID != -1) {
+	      options.addElement(new RETokenPOSIX(subIndex,posixID,insens,negate));
+	    } else if (asciiEsc != 0) {
+	      lastChar = asciiEsc;
+	    } else {
+	      lastChar = pattern[index];
+	    }
+	    ++index;
+	  } else if ((ch == '[') && (syntax.get(RESyntax.RE_CHAR_CLASSES)) && (index < pLength) && (pattern[index] == ':')) {
+	    StringBuffer posixSet = new StringBuffer();
+	    index = getPosixSet(pattern,index+1,posixSet);
+	    int posixId = RETokenPOSIX.intValue(posixSet.toString());
+	    if (posixId != -1)
+	      options.addElement(new RETokenPOSIX(subIndex,posixId,insens,false));
+	  } else {
+	    if (lastChar != 0) options.addElement(new RETokenChar(subIndex,lastChar,insens));
+	    lastChar = ch;
+	  }
+	  if (index == pLength) throw new REException(getLocalizedMessage("class.no.end"),REException.REG_EBRACK,index);
+	} // while in list
+	// Out of list, index is one past ']'
+	    
+	if (lastChar != 0) options.addElement(new RETokenChar(subIndex,lastChar,insens));
+	    
+	// Create a new RETokenOneOf
+	addToken(currentToken);
+	options.trimToSize();
+	currentToken = new RETokenOneOf(subIndex,options,negative);
+      }
+
+      // SUBEXPRESSIONS
+      //  (...) | \(...\) depending on RE_NO_BK_PARENS
+
+      else if ((unit.ch == '(') && (syntax.get(RESyntax.RE_NO_BK_PARENS) ^ (unit.bk || quot))) {
+	boolean pure = false;
+	boolean comment = false;
+        boolean lookAhead = false;
+        boolean negativelh = false;
+	if ((index+1 < pLength) && (pattern[index] == '?')) {
+	  switch (pattern[index+1]) {
+          case '!':
+            if (syntax.get(RESyntax.RE_LOOKAHEAD)) {
+              pure = true;
+              negativelh = true;
+              lookAhead = true;
+              index += 2;
+            }
+            break;
+          case '=':
+            if (syntax.get(RESyntax.RE_LOOKAHEAD)) {
+              pure = true;
+              lookAhead = true;
+              index += 2;
+            }
+            break;
+	  case ':':
+	    if (syntax.get(RESyntax.RE_PURE_GROUPING)) {
+	      pure = true;
+	      index += 2;
+	    }
+	    break;
+	  case '#':
+	    if (syntax.get(RESyntax.RE_COMMENTS)) {
+	      comment = true;
+	    }
+	    break;
+          default:
+            throw new REException(getLocalizedMessage("repeat.no.token"), REException.REG_BADRPT, index);
+	  }
+	}
+
+	if (index >= pLength) {
+	    throw new REException(getLocalizedMessage("unmatched.paren"), REException.REG_ESUBREG,index);
+	}
+
+	// find end of subexpression
+	int endIndex = index;
+	int nextIndex = index;
+	int nested = 0;
+
+	while ( ((nextIndex = getCharUnit(pattern,endIndex,unit,false)) > 0)
+		&& !(nested == 0 && (unit.ch == ')') && (syntax.get(RESyntax.RE_NO_BK_PARENS) ^ (unit.bk || quot))) )
+	  if ((endIndex = nextIndex) >= pLength)
+	    throw new REException(getLocalizedMessage("subexpr.no.end"),REException.REG_ESUBREG,nextIndex);
+	  else if (unit.ch == '(' && (syntax.get(RESyntax.RE_NO_BK_PARENS) ^ (unit.bk || quot)))
+	    nested++;
+	  else if (unit.ch == ')' && (syntax.get(RESyntax.RE_NO_BK_PARENS) ^ (unit.bk || quot)))
+	    nested--;
+
+	// endIndex is now position at a ')','\)' 
+	// nextIndex is end of string or position after ')' or '\)'
+
+	if (comment) index = nextIndex;
+	else { // not a comment
+	  // create RE subexpression as token.
+	  addToken(currentToken);
+	  if (!pure) {
+	    numSubs++;
+	  }
+
+	  int useIndex = (pure || lookAhead) ? 0 : nextSub + numSubs;
+	  currentToken = new RE(String.valueOf(pattern,index,endIndex-index).toCharArray(),cflags,syntax,useIndex,nextSub + numSubs);
+	  numSubs += ((RE) currentToken).getNumSubs();
+
+          if (lookAhead) {
+	      currentToken = new RETokenLookAhead(currentToken,negativelh);
+	  }
+
+	  index = nextIndex;
+	} // not a comment
+      } // subexpression
+    
+      // UNMATCHED RIGHT PAREN
+      // ) or \) throw exception if
+      // !syntax.get(RESyntax.RE_UNMATCHED_RIGHT_PAREN_ORD)
+      else if (!syntax.get(RESyntax.RE_UNMATCHED_RIGHT_PAREN_ORD) && ((unit.ch == ')') && (syntax.get(RESyntax.RE_NO_BK_PARENS) ^ (unit.bk || quot)))) {
+	throw new REException(getLocalizedMessage("unmatched.paren"),REException.REG_EPAREN,index);
+      }
+
+      // START OF LINE OPERATOR
+      //  ^
+
+      else if ((unit.ch == '^') && !(unit.bk || quot)) {
+	addToken(currentToken);
+	currentToken = null;
+	addToken(new RETokenStart(subIndex,((cflags & REG_MULTILINE) > 0) ? syntax.getLineSeparator() : null));
+      }
+
+      // END OF LINE OPERATOR
+      //  $
+
+      else if ((unit.ch == '$') && !(unit.bk || quot)) {
+	addToken(currentToken);
+	currentToken = null;
+	addToken(new RETokenEnd(subIndex,((cflags & REG_MULTILINE) > 0) ? syntax.getLineSeparator() : null));
+      }
+
+      // MATCH-ANY-CHARACTER OPERATOR (except possibly newline and null)
+      //  .
+
+      else if ((unit.ch == '.') && !(unit.bk || quot)) {
+	addToken(currentToken);
+	currentToken = new RETokenAny(subIndex,syntax.get(RESyntax.RE_DOT_NEWLINE) || ((cflags & REG_DOT_NEWLINE) > 0),syntax.get(RESyntax.RE_DOT_NOT_NULL));
+      }
+
+      // ZERO-OR-MORE REPEAT OPERATOR
+      //  *
+
+      else if ((unit.ch == '*') && !(unit.bk || quot)) {
+	if (currentToken == null)
+          throw new REException(getLocalizedMessage("repeat.no.token"),REException.REG_BADRPT,index);
+	if (currentToken instanceof RETokenRepeated)
+          throw new REException(getLocalizedMessage("repeat.chained"),REException.REG_BADRPT,index);
+	if (currentToken instanceof RETokenWordBoundary || currentToken instanceof RETokenWordBoundary)
+	  throw new REException(getLocalizedMessage("repeat.assertion"),REException.REG_BADRPT,index);
+	if (currentToken.getMinimumLength() == 0)
+	  throw new REException(getLocalizedMessage("repeat.empty.token"),REException.REG_BADRPT,index);
+	currentToken = setRepeated(currentToken,0,Integer.MAX_VALUE,index);
+      }
+
+      // ONE-OR-MORE REPEAT OPERATOR / POSSESSIVE MATCHING OPERATOR
+      //  + | \+ depending on RE_BK_PLUS_QM
+      //  not available if RE_LIMITED_OPS is set
+
+      else if ((unit.ch == '+') && !syntax.get(RESyntax.RE_LIMITED_OPS) && (!syntax.get(RESyntax.RE_BK_PLUS_QM) ^ (unit.bk || quot))) {
+	if (currentToken == null)
+          throw new REException(getLocalizedMessage("repeat.no.token"),REException.REG_BADRPT,index);
+	
+	// Check for possessive matching on RETokenRepeated
+	if (currentToken instanceof RETokenRepeated) {
+	  RETokenRepeated tokenRep = (RETokenRepeated)currentToken;
+	  if (syntax.get(RESyntax.RE_POSSESSIVE_OPS) && !tokenRep.isPossessive() && !tokenRep.isStingy())
+	    tokenRep.makePossessive();
+	  else
+	    throw new REException(getLocalizedMessage("repeat.chained"),REException.REG_BADRPT,index);
+
+	}
+	else if (currentToken instanceof RETokenWordBoundary || currentToken instanceof RETokenWordBoundary)
+	  throw new REException(getLocalizedMessage("repeat.assertion"),REException.REG_BADRPT,index);
+	else if (currentToken.getMinimumLength() == 0)
+	  throw new REException(getLocalizedMessage("repeat.empty.token"),REException.REG_BADRPT,index);
+	else
+	  currentToken = setRepeated(currentToken,1,Integer.MAX_VALUE,index);
+      }
+
+      // ZERO-OR-ONE REPEAT OPERATOR / STINGY MATCHING OPERATOR
+      //  ? | \? depending on RE_BK_PLUS_QM
+      //  not available if RE_LIMITED_OPS is set
+      //  stingy matching if RE_STINGY_OPS is set and it follows a quantifier
+
+      else if ((unit.ch == '?') && !syntax.get(RESyntax.RE_LIMITED_OPS) && (!syntax.get(RESyntax.RE_BK_PLUS_QM) ^ (unit.bk || quot))) {
+	if (currentToken == null) throw new REException(getLocalizedMessage("repeat.no.token"),REException.REG_BADRPT,index);
+
+	// Check for stingy matching on RETokenRepeated
+	if (currentToken instanceof RETokenRepeated) {
+	  RETokenRepeated tokenRep = (RETokenRepeated)currentToken;
+	  if (syntax.get(RESyntax.RE_STINGY_OPS) && !tokenRep.isStingy() && !tokenRep.isPossessive())
+	    tokenRep.makeStingy();
+	  else
+	    throw new REException(getLocalizedMessage("repeat.chained"),REException.REG_BADRPT,index);
+	}
+	else if (currentToken instanceof RETokenWordBoundary || currentToken instanceof RETokenWordBoundary)
+	  throw new REException(getLocalizedMessage("repeat.assertion"),REException.REG_BADRPT,index);
+	else
+	  currentToken = setRepeated(currentToken,0,1,index);
+      }
+	
+      // BACKREFERENCE OPERATOR
+      //  \1 \2 ... \9
+      // not available if RE_NO_BK_REFS is set
+
+      else if (unit.bk && Character.isDigit(unit.ch) && !syntax.get(RESyntax.RE_NO_BK_REFS)) {
+	addToken(currentToken);
+	currentToken = new RETokenBackRef(subIndex,Character.digit(unit.ch,10),insens);
+      }
+
+      // START OF STRING OPERATOR
+      //  \A if RE_STRING_ANCHORS is set
+      
+      else if (unit.bk && (unit.ch == 'A') && syntax.get(RESyntax.RE_STRING_ANCHORS)) {
+	addToken(currentToken);
+	currentToken = new RETokenStart(subIndex,null);
+      }
+
+      // WORD BREAK OPERATOR
+      //  \b if ????
+
+      else if (unit.bk && (unit.ch == 'b') && syntax.get(RESyntax.RE_STRING_ANCHORS)) {
+	  addToken(currentToken);
+	  currentToken = new RETokenWordBoundary(subIndex, RETokenWordBoundary.BEGIN | RETokenWordBoundary.END, false);
+      } 
+
+      // WORD BEGIN OPERATOR 
+      //  \< if ????
+      else if (unit.bk && (unit.ch == '<')) {
+	  addToken(currentToken);
+	  currentToken = new RETokenWordBoundary(subIndex, RETokenWordBoundary.BEGIN, false);
+      } 
+
+      // WORD END OPERATOR 
+      //  \> if ????
+      else if (unit.bk && (unit.ch == '>')) {
+	  addToken(currentToken);
+	  currentToken = new RETokenWordBoundary(subIndex, RETokenWordBoundary.END, false);
+      } 
+
+      // NON-WORD BREAK OPERATOR
+      // \B if ????
+
+      else if (unit.bk && (unit.ch == 'B') && syntax.get(RESyntax.RE_STRING_ANCHORS)) {
+	  addToken(currentToken);
+	  currentToken = new RETokenWordBoundary(subIndex, RETokenWordBoundary.BEGIN | RETokenWordBoundary.END, true);
+      } 
+
+      
+      // DIGIT OPERATOR
+      //  \d if RE_CHAR_CLASS_ESCAPES is set
+      
+      else if (unit.bk && (unit.ch == 'd') && syntax.get(RESyntax.RE_CHAR_CLASS_ESCAPES)) {
+	addToken(currentToken);
+	currentToken = new RETokenPOSIX(subIndex,RETokenPOSIX.DIGIT,insens,false);
+      }
+
+      // NON-DIGIT OPERATOR
+      //  \D
+
+	else if (unit.bk && (unit.ch == 'D') && syntax.get(RESyntax.RE_CHAR_CLASS_ESCAPES)) {
+	  addToken(currentToken);
+	  currentToken = new RETokenPOSIX(subIndex,RETokenPOSIX.DIGIT,insens,true);
+	}
+
+	// NEWLINE ESCAPE
+        //  \n
+
+	else if (unit.bk && (unit.ch == 'n')) {
+	  addToken(currentToken);
+	  currentToken = new RETokenChar(subIndex,'\n',false);
+	}
+
+	// RETURN ESCAPE
+        //  \r
+
+	else if (unit.bk && (unit.ch == 'r')) {
+	  addToken(currentToken);
+	  currentToken = new RETokenChar(subIndex,'\r',false);
+	}
+
+	// WHITESPACE OPERATOR
+        //  \s if RE_CHAR_CLASS_ESCAPES is set
+
+	else if (unit.bk && (unit.ch == 's') && syntax.get(RESyntax.RE_CHAR_CLASS_ESCAPES)) {
+	  addToken(currentToken);
+	  currentToken = new RETokenPOSIX(subIndex,RETokenPOSIX.SPACE,insens,false);
+	}
+
+	// NON-WHITESPACE OPERATOR
+        //  \S
+
+	else if (unit.bk && (unit.ch == 'S') && syntax.get(RESyntax.RE_CHAR_CLASS_ESCAPES)) {
+	  addToken(currentToken);
+	  currentToken = new RETokenPOSIX(subIndex,RETokenPOSIX.SPACE,insens,true);
+	}
+
+	// TAB ESCAPE
+        //  \t
+
+	else if (unit.bk && (unit.ch == 't')) {
+	  addToken(currentToken);
+	  currentToken = new RETokenChar(subIndex,'\t',false);
+	}
+
+	// ALPHANUMERIC OPERATOR
+        //  \w
+
+	else if (unit.bk && (unit.ch == 'w') && syntax.get(RESyntax.RE_CHAR_CLASS_ESCAPES)) {
+	  addToken(currentToken);
+	  currentToken = new RETokenPOSIX(subIndex,RETokenPOSIX.ALNUM,insens,false);
+	}
+
+	// NON-ALPHANUMERIC OPERATOR
+        //  \W
+
+	else if (unit.bk && (unit.ch == 'W') && syntax.get(RESyntax.RE_CHAR_CLASS_ESCAPES)) {
+	  addToken(currentToken);
+	  currentToken = new RETokenPOSIX(subIndex,RETokenPOSIX.ALNUM,insens,true);
+	}
+
+	// END OF STRING OPERATOR
+        //  \Z
+
+	else if (unit.bk && (unit.ch == 'Z') && syntax.get(RESyntax.RE_STRING_ANCHORS)) {
+	  addToken(currentToken);
+	  currentToken = new RETokenEnd(subIndex,null);
+	}
+
+	// NON-SPECIAL CHARACTER (or escape to make literal)
+        //  c | \* for example
+
+	else {  // not a special character
+	  addToken(currentToken);
+	  currentToken = new RETokenChar(subIndex,unit.ch,insens);
+	} 
+      } // end while
+
+    // Add final buffered token and an EndSub marker
+    addToken(currentToken);
+      
+    if (branches != null) {
+	branches.addElement(new RE(firstToken,lastToken,numSubs,subIndex,minimumLength));
+	branches.trimToSize(); // compact the Vector
+	minimumLength = 0;
+	firstToken = lastToken = null;
+	addToken(new RETokenOneOf(subIndex,branches,false));
+    } 
+    else addToken(new RETokenEndSub(subIndex));
+
+  }
+
+  private static int getCharUnit(char[] input, int index, CharUnit unit, boolean quot) throws REException {
+    unit.ch = input[index++];
+    unit.bk = (unit.ch == '\\'
+	       && (!quot || index >= input.length || input[index] == 'E'));
+    if (unit.bk)
+      if (index < input.length)
+	unit.ch = input[index++];
+      else throw new REException(getLocalizedMessage("ends.with.backslash"),REException.REG_ESCAPE,index);
+    return index;
+  }
+
+  /**
+   * Checks if the regular expression matches the input in its entirety.
+   *
+   * @param input The input text.
+   */
+  public boolean isMatch(Object input) {
+    return isMatch(input,0,0);
+  }
+  
+  /**
+   * Checks if the input string, starting from index, is an exact match of
+   * this regular expression.
+   *
+   * @param input The input text.
+   * @param index The offset index at which the search should be begin.
+   */
+  public boolean isMatch(Object input,int index) {
+    return isMatch(input,index,0);
+  }
+  
+
+  /**
+   * Checks if the input, starting from index and using the specified
+   * execution flags, is an exact match of this regular expression.
+   *
+   * @param input The input text.
+   * @param index The offset index at which the search should be begin.
+   * @param eflags The logical OR of any execution flags above.
+   */
+  public boolean isMatch(Object input,int index,int eflags) {
+    return isMatchImpl(makeCharIndexed(input,index),index,eflags);
+  }
+
+  private boolean isMatchImpl(CharIndexed input, int index, int eflags) {
+    if (firstToken == null)  // Trivial case
+      return (input.charAt(0) == CharIndexed.OUT_OF_BOUNDS);
+    REMatch m = new REMatch(numSubs, index, eflags);
+    if (firstToken.match(input, m)) {
+	while (m != null) {
+	    if (input.charAt(m.index) == CharIndexed.OUT_OF_BOUNDS) {
+		return true;
+	    }
+	    m = m.next;
+	}
+    }
+    return false;
+  }
+    
+  /**
+   * Returns the maximum number of subexpressions in this regular expression.
+   * If the expression contains branches, the value returned will be the
+   * maximum subexpressions in any of the branches.
+   */
+  public int getNumSubs() {
+    return numSubs;
+  }
+
+  // Overrides REToken.setUncle
+  void setUncle(REToken uncle) {
+      if (lastToken != null) {
+	  lastToken.setUncle(uncle);
+      } else super.setUncle(uncle); // to deal with empty subexpressions
+  }
+
+  // Overrides REToken.chain
+
+  boolean chain(REToken next) {
+    super.chain(next);
+    setUncle(next);
+    return true;
+  }
+
+  /**
+   * Returns the minimum number of characters that could possibly
+   * constitute a match of this regular expression.
+   */
+  public int getMinimumLength() {
+      return minimumLength;
+  }
+
+  /**
+   * Returns an array of all matches found in the input.
+   *
+   * If the regular expression allows the empty string to match, it will
+   * substitute matches at all positions except the end of the input.
+   *
+   * @param input The input text.
+   * @return a non-null (but possibly zero-length) array of matches
+   */
+  public REMatch[] getAllMatches(Object input) {
+    return getAllMatches(input,0,0);
+  }
+
+  /**
+   * Returns an array of all matches found in the input,
+   * beginning at the specified index position.
+   *
+   * If the regular expression allows the empty string to match, it will
+   * substitute matches at all positions except the end of the input.
+   *
+   * @param input The input text.
+   * @param index The offset index at which the search should be begin.
+   * @return a non-null (but possibly zero-length) array of matches
+   */
+  public REMatch[] getAllMatches(Object input, int index) {
+    return getAllMatches(input,index,0);
+  }
+
+  /**
+   * Returns an array of all matches found in the input string,
+   * beginning at the specified index position and using the specified
+   * execution flags.
+   *
+   * If the regular expression allows the empty string to match, it will
+   * substitute matches at all positions except the end of the input.
+   *
+   * @param input The input text.
+   * @param index The offset index at which the search should be begin.
+   * @param eflags The logical OR of any execution flags above.
+   * @return a non-null (but possibly zero-length) array of matches
+   */
+  public REMatch[] getAllMatches(Object input, int index, int eflags) {
+    return getAllMatchesImpl(makeCharIndexed(input,index),index,eflags);
+  }
+
+  // this has been changed since 1.03 to be non-overlapping matches
+  private REMatch[] getAllMatchesImpl(CharIndexed input, int index, int eflags) {
+    Vector all = new Vector();
+    REMatch m = null;
+    while ((m = getMatchImpl(input,index,eflags,null)) != null) {
+      all.addElement(m);
+      index = m.getEndIndex();
+      if (m.end[0] == 0) {   // handle pathological case of zero-length match
+	index++;
+	input.move(1);
+      } else {
+	input.move(m.end[0]);
+      }
+      if (!input.isValid()) break;
+    }
+    REMatch[] mset = new REMatch[all.size()];
+    all.copyInto(mset);
+    return mset;
+  }
+  
+    /* Implements abstract method REToken.match() */
+    boolean match(CharIndexed input, REMatch mymatch) { 
+	if (firstToken == null) return next(input, mymatch);
+
+	// Note the start of this subexpression
+	mymatch.start[subIndex] = mymatch.index;
+
+	return firstToken.match(input, mymatch);
+    }
+  
+  /**
+   * Returns the first match found in the input.  If no match is found,
+   * null is returned.
+   *
+   * @param input The input text.
+   * @return An REMatch instance referencing the match, or null if none.
+   */
+  public REMatch getMatch(Object input) {
+    return getMatch(input,0,0);
+  }
+  
+  /**
+   * Returns the first match found in the input, beginning
+   * the search at the specified index.  If no match is found,
+   * returns null.
+   *
+   * @param input The input text.
+   * @param index The offset within the text to begin looking for a match.
+   * @return An REMatch instance referencing the match, or null if none.
+   */
+  public REMatch getMatch(Object input, int index) {
+    return getMatch(input,index,0);
+  }
+  
+  /**
+   * Returns the first match found in the input, beginning
+   * the search at the specified index, and using the specified
+   * execution flags.  If no match is found, returns null.
+   *
+   * @param input The input text.
+   * @param index The offset index at which the search should be begin.
+   * @param eflags The logical OR of any execution flags above.
+   * @return An REMatch instance referencing the match, or null if none.
+   */
+  public REMatch getMatch(Object input, int index, int eflags) {
+    return getMatch(input,index,eflags,null);
+  }
+
+  /**
+   * Returns the first match found in the input, beginning the search
+   * at the specified index, and using the specified execution flags.
+   * If no match is found, returns null.  If a StringBuffer is
+   * provided and is non-null, the contents of the input text from the
+   * index to the beginning of the match (or to the end of the input,
+   * if there is no match) are appended to the StringBuffer.
+   *
+   * @param input The input text.
+   * @param index The offset index at which the search should be begin.
+   * @param eflags The logical OR of any execution flags above.
+   * @param buffer The StringBuffer to save pre-match text in.
+   * @return An REMatch instance referencing the match, or null if none.  */
+  public REMatch getMatch(Object input, int index, int eflags, StringBuffer buffer) {
+    return getMatchImpl(makeCharIndexed(input,index),index,eflags,buffer);
+  }
+
+  REMatch getMatchImpl(CharIndexed input, int anchor, int eflags, StringBuffer buffer) {
+      // Create a new REMatch to hold results
+      REMatch mymatch = new REMatch(numSubs, anchor, eflags);
+      do {
+	  // Optimization: check if anchor + minimumLength > length
+	  if (minimumLength == 0 || input.charAt(minimumLength-1) != CharIndexed.OUT_OF_BOUNDS) {
+	      if (match(input, mymatch)) {
+		  // Find longest match of them all to observe leftmost longest
+		  REMatch longest = mymatch;
+		  while ((mymatch = mymatch.next) != null) {
+		      if (mymatch.index > longest.index) {
+			  longest = mymatch;
+		      }
+		  }
+		  
+		  longest.end[0] = longest.index;
+		  longest.finish(input);
+		  return longest;
+	      }
+	  }
+	  mymatch.clear(++anchor);
+	  // Append character to buffer if needed
+	  if (buffer != null && input.charAt(0) != CharIndexed.OUT_OF_BOUNDS) {
+	      buffer.append(input.charAt(0));
+	  }
+      } while (input.move(1));
+      
+      // Special handling at end of input for e.g. "$"
+      if (minimumLength == 0) {
+	  if (match(input, mymatch)) {
+	      mymatch.finish(input);
+	      return mymatch;
+	  }
+      }
+
+      return null;
+  }
+
+  /**
+   * Returns an REMatchEnumeration that can be used to iterate over the
+   * matches found in the input text.
+   *
+   * @param input The input text.
+   * @return A non-null REMatchEnumeration instance.
+   */
+  public REMatchEnumeration getMatchEnumeration(Object input) {
+    return getMatchEnumeration(input,0,0);
+  }
+
+
+  /**
+   * Returns an REMatchEnumeration that can be used to iterate over the
+   * matches found in the input text.
+   *
+   * @param input The input text.
+   * @param index The offset index at which the search should be begin.
+   * @return A non-null REMatchEnumeration instance, with its input cursor
+   *  set to the index position specified.
+   */
+  public REMatchEnumeration getMatchEnumeration(Object input, int index) {
+    return getMatchEnumeration(input,index,0);
+  }
+
+  /**
+   * Returns an REMatchEnumeration that can be used to iterate over the
+   * matches found in the input text.
+   *
+   * @param input The input text.
+   * @param index The offset index at which the search should be begin.
+   * @param eflags The logical OR of any execution flags above.
+   * @return A non-null REMatchEnumeration instance, with its input cursor
+   *  set to the index position specified.
+   */
+  public REMatchEnumeration getMatchEnumeration(Object input, int index, int eflags) {
+    return new REMatchEnumeration(this,makeCharIndexed(input,index),index,eflags);
+  }
+
+
+  /**
+   * Substitutes the replacement text for the first match found in the input.
+   *
+   * @param input The input text.
+   * @param replace The replacement text, which may contain $x metacharacters (see REMatch.substituteInto).
+   * @return A String interpolating the substituted text.
+   * @see REMatch#substituteInto
+   */
+  public String substitute(Object input,String replace) {
+    return substitute(input,replace,0,0);
+  }
+
+  /**
+   * Substitutes the replacement text for the first match found in the input
+   * beginning at the specified index position.  Specifying an index
+   * effectively causes the regular expression engine to throw away the
+   * specified number of characters. 
+   *
+   * @param input The input text.
+   * @param replace The replacement text, which may contain $x metacharacters (see REMatch.substituteInto).
+   * @param index The offset index at which the search should be begin.
+   * @return A String containing the substring of the input, starting
+   *   at the index position, and interpolating the substituted text.
+   * @see REMatch#substituteInto
+   */
+  public String substitute(Object input,String replace,int index) {
+    return substitute(input,replace,index,0);
+  }
+
+  /**
+   * Substitutes the replacement text for the first match found in the input
+   * string, beginning at the specified index position and using the
+   * specified execution flags.
+   *
+   * @param input The input text.
+   * @param replace The replacement text, which may contain $x metacharacters (see REMatch.substituteInto).
+   * @param index The offset index at which the search should be begin.
+   * @param eflags The logical OR of any execution flags above.
+   * @return A String containing the substring of the input, starting
+   *   at the index position, and interpolating the substituted text.
+   * @see REMatch#substituteInto
+   */
+  public String substitute(Object input,String replace,int index,int eflags) {
+    return substituteImpl(makeCharIndexed(input,index),replace,index,eflags);
+  }
+
+  private String substituteImpl(CharIndexed input,String replace,int index,int eflags) {
+    StringBuffer buffer = new StringBuffer();
+    REMatch m = getMatchImpl(input,index,eflags,buffer);
+    if (m==null) return buffer.toString();
+    buffer.append( ((eflags & REG_NO_INTERPOLATE) > 0) ?
+		   replace : m.substituteInto(replace) );
+    if (input.move(m.end[0])) {
+      do {
+	buffer.append(input.charAt(0));
+      } while (input.move(1));
+    }
+    return buffer.toString();
+  }
+  
+  /**
+   * Substitutes the replacement text for each non-overlapping match found 
+   * in the input text.
+   *
+   * @param input The input text.
+   * @param replace The replacement text, which may contain $x metacharacters (see REMatch.substituteInto).
+   * @return A String interpolating the substituted text.
+   * @see REMatch#substituteInto
+   */
+  public String substituteAll(Object input,String replace) {
+    return substituteAll(input,replace,0,0);
+  }
+
+  /**
+   * Substitutes the replacement text for each non-overlapping match found 
+   * in the input text, starting at the specified index.
+   *
+   * If the regular expression allows the empty string to match, it will
+   * substitute matches at all positions except the end of the input.
+   *
+   * @param input The input text.
+   * @param replace The replacement text, which may contain $x metacharacters (see REMatch.substituteInto).
+   * @param index The offset index at which the search should be begin.
+   * @return A String containing the substring of the input, starting
+   *   at the index position, and interpolating the substituted text.
+   * @see REMatch#substituteInto
+   */
+  public String substituteAll(Object input,String replace,int index) {
+    return substituteAll(input,replace,index,0);
+  }
+ 
+  /**
+   * Substitutes the replacement text for each non-overlapping match found 
+   * in the input text, starting at the specified index and using the
+   * specified execution flags.
+   *
+   * @param input The input text.
+   * @param replace The replacement text, which may contain $x metacharacters (see REMatch.substituteInto).
+   * @param index The offset index at which the search should be begin.
+   * @param eflags The logical OR of any execution flags above.
+   * @return A String containing the substring of the input, starting
+   *   at the index position, and interpolating the substituted text.
+   * @see REMatch#substituteInto
+   */
+  public String substituteAll(Object input,String replace,int index,int eflags) {
+    return substituteAllImpl(makeCharIndexed(input,index),replace,index,eflags);
+  }
+
+  private String substituteAllImpl(CharIndexed input,String replace,int index,int eflags) {
+    StringBuffer buffer = new StringBuffer();
+    REMatch m;
+    while ((m = getMatchImpl(input,index,eflags,buffer)) != null) {
+	buffer.append( ((eflags & REG_NO_INTERPOLATE) > 0) ?
+		       replace : m.substituteInto(replace) );
+      index = m.getEndIndex();
+      if (m.end[0] == 0) {
+	char ch = input.charAt(0);
+	if (ch != CharIndexed.OUT_OF_BOUNDS) 
+	    buffer.append(ch);
+	input.move(1);
+      } else {
+	  input.move(m.end[0]);
+      }
+
+      if (!input.isValid()) break;
+    }
+    return buffer.toString();
+  }
+  
+  /* Helper function for constructor */
+  private void addToken(REToken next) {
+    if (next == null) return;
+    minimumLength += next.getMinimumLength();
+    if (firstToken == null) {
+	lastToken = firstToken = next;
+    } else {
+      // if chain returns false, it "rejected" the token due to
+      // an optimization, and next was combined with lastToken
+      if (lastToken.chain(next)) {
+	  lastToken = next;
+      }
+    }
+  }
+
+  private static REToken setRepeated(REToken current, int min, int max, int index) throws REException {
+    if (current == null) throw new REException(getLocalizedMessage("repeat.no.token"),REException.REG_BADRPT,index);
+    return new RETokenRepeated(current.subIndex,current,min,max);
+  }
+
+  private static int getPosixSet(char[] pattern,int index,StringBuffer buf) {
+    // Precondition: pattern[index-1] == ':'
+    // we will return pos of closing ']'.
+    int i;
+    for (i=index; i<(pattern.length-1); i++) {
+      if ((pattern[i] == ':') && (pattern[i+1] == ']'))
+	return i+2;
+      buf.append(pattern[i]);
+    }
+    return index; // didn't match up
+  }
+
+  private int getMinMax(char[] input,int index,IntPair minMax,RESyntax syntax) throws REException {
+    // Precondition: input[index-1] == '{', minMax != null
+
+    boolean mustMatch = !syntax.get(RESyntax.RE_NO_BK_BRACES);
+    int startIndex = index;
+    if (index == input.length) {
+      if (mustMatch)
+        throw new REException(getLocalizedMessage("unmatched.brace"),REException.REG_EBRACE,index);
+      else
+        return startIndex;
+    }
+    
+    int min,max=0;
+    CharUnit unit = new CharUnit();
+    StringBuffer buf = new StringBuffer();
+    
+    // Read string of digits
+    do {
+      index = getCharUnit(input,index,unit,false);
+      if (Character.isDigit(unit.ch))
+        buf.append(unit.ch);
+    } while ((index != input.length) && Character.isDigit(unit.ch));
+
+    // Check for {} tomfoolery
+    if (buf.length() == 0) {
+      if (mustMatch)
+        throw new REException(getLocalizedMessage("interval.error"),REException.REG_EBRACE,index);
+      else
+        return startIndex;
+    }
+
+    min = Integer.parseInt(buf.toString());
+	
+    if ((unit.ch == '}') && (syntax.get(RESyntax.RE_NO_BK_BRACES) ^ unit.bk))
+      max = min;
+    else if (index == input.length)
+      if (mustMatch)
+        throw new REException(getLocalizedMessage("interval.no.end"),REException.REG_EBRACE,index);
+      else
+        return startIndex;
+    else if ((unit.ch == ',') && !unit.bk) {
+      buf = new StringBuffer();
+      // Read string of digits
+      while (((index = getCharUnit(input,index,unit,false)) != input.length) && Character.isDigit(unit.ch))
+	buf.append(unit.ch);
+
+      if (!((unit.ch == '}') && (syntax.get(RESyntax.RE_NO_BK_BRACES) ^ unit.bk)))
+        if (mustMatch)
+          throw new REException(getLocalizedMessage("interval.error"),REException.REG_EBRACE,index);
+        else
+          return startIndex;
+
+      // This is the case of {x,}
+      if (buf.length() == 0) max = Integer.MAX_VALUE;
+      else max = Integer.parseInt(buf.toString());
+    } else
+      if (mustMatch)
+        throw new REException(getLocalizedMessage("interval.error"),REException.REG_EBRACE,index);
+      else
+        return startIndex;
+
+    // We know min and max now, and they are valid.
+
+    minMax.first = min;
+    minMax.second = max;
+
+    // return the index following the '}'
+    return index;
+  }
+
+   /**
+    * Return a human readable form of the compiled regular expression,
+    * useful for debugging.
+    */
+   public String toString() {
+     StringBuffer sb = new StringBuffer();
+     dump(sb);
+     return sb.toString();
+   }
+
+  void dump(StringBuffer os) {
+    os.append('(');
+    if (subIndex == 0)
+      os.append("?:");
+    if (firstToken != null)
+      firstToken.dumpAll(os);
+    os.append(')');
+  }
+
+  // Cast input appropriately or throw exception
+  private static CharIndexed makeCharIndexed(Object input, int index) {
+      // We could let a String fall through to final input, but since
+      // it's the most likely input type, we check it first.
+    if (input instanceof String)
+      return new CharIndexedString((String) input,index);
+    else if (input instanceof char[])
+      return new CharIndexedCharArray((char[]) input,index);
+    else if (input instanceof StringBuffer)
+      return new CharIndexedStringBuffer((StringBuffer) input,index);
+    else if (input instanceof InputStream)
+      return new CharIndexedInputStream((InputStream) input,index);
+    else if (input instanceof CharIndexed)
+	return (CharIndexed) input; // do we lose index info?
+    else 
+	return new CharIndexedString(input.toString(), index);
+  }
+}
diff --git a/libjava/classpath/gnu/regexp/REException.java b/libjava/classpath/gnu/regexp/REException.java
new file mode 100644
index 00000000000..73f86fa8add
--- /dev/null
+++ b/libjava/classpath/gnu/regexp/REException.java
@@ -0,0 +1,182 @@
+/* gnu/regexp/REException.java
+   Copyright (C) 1998-2001, 2004 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+package gnu.regexp;
+
+import java.text.MessageFormat;
+
+/**
+ * This is the regular expression exception class.  An exception of this type
+ * defines the three attributes:
+ * <OL>
+ * <LI> A descriptive message of the error.
+ * <LI> An integral type code equivalent to one of the statically
+ *      defined symbols listed below.
+ * <LI> The approximate position in the input string where the error
+ *      occurred.
+ * </OL>
+ *
+ * @author <A HREF="mailto:wes@cacas.org">Wes Biggs</A>
+ */
+
+public class REException extends Exception {
+  private int type;
+  private int pos;
+
+  // Error conditions from GNU regcomp(3) manual
+
+  /**
+   * Error flag.
+   * Invalid use of repetition operators such  as  using
+   * `*' as the first character.
+   */
+  public static final int REG_BADRPT  =  1;
+
+  /**
+   * Error flag.
+   * Invalid use of back reference operator.
+   */
+  public static final int REG_BADBR   =  2;
+
+  /**
+   * Error flag.
+   * Un-matched brace interval operators.
+   */
+  public static final int REG_EBRACE  =  3;
+
+  /**
+   * Error flag.
+   * Un-matched bracket list operators.
+   */
+  public static final int REG_EBRACK  =  4;
+
+  /**
+   * Error flag.
+   * Invalid  use  of the range operator, eg. the ending
+   * point of the range occurs  prior  to  the  starting
+   * point.
+   */
+  public static final int REG_ERANGE  =  5;
+
+  /**
+   * Error flag.
+   * Unknown character class name. <B>Not implemented</B>.
+   */
+  public static final int REG_ECTYPE  =  6;
+
+  /**
+   * Error flag.
+   * Un-matched parenthesis group operators.
+   */
+  public static final int REG_EPAREN  =  7;
+
+  /**
+   * Error flag.
+   * Invalid back reference to a subexpression.
+   */
+  public static final int REG_ESUBREG =  8;
+
+  /**
+   * Error flag.
+   * Non specific error. <B>Not implemented</B>.
+   */
+  public static final int REG_EEND    =  9;
+
+  /**
+   * Error flag.
+   * Invalid escape sequence. <B>Not implemented</B>.
+   */
+  public static final int REG_ESCAPE  = 10;
+
+  /**
+   * Error flag.
+   * Invalid  use  of pattern operators such as group or list.
+   */
+  public static final int REG_BADPAT  = 11;
+
+  /**
+   * Error flag.
+   * Compiled  regular  expression  requires  a  pattern
+   * buffer larger than 64Kb. <B>Not implemented</B>.
+   */
+  public static final int REG_ESIZE   = 12;
+
+  /**
+   * Error flag.
+   * The regex routines ran out of memory. <B>Not implemented</B>.
+   */
+  public static final int REG_ESPACE  = 13;
+
+  REException(String msg, int type, int position) { 
+    super(msg); 
+    this.type = type;
+    this.pos = position;
+  }
+
+  /**
+   * Returns the type of the exception, one of the constants listed above.
+   */
+
+  public int getType() {
+    return type;
+  }
+
+  /**
+   * Returns the position, relative to the string or character array being
+   * compiled, where the error occurred.  This position is generally the point
+   * where the error was detected, not necessarily the starting index of
+   * a bad subexpression.
+   */
+  public int getPosition() {
+    return pos;
+  }
+
+  /**
+   * Reports the descriptive message associated with this exception
+   * as well as its index position in the string or character array
+   * being compiled.
+   */
+  public String getMessage() {
+    Object[] args = {new Integer(pos)};
+    StringBuffer sb = new StringBuffer();
+    String prefix = RE.getLocalizedMessage("error.prefix");
+    sb.append(MessageFormat.format(prefix, args));
+    sb.append('\n');
+    sb.append(super.getMessage());
+    return sb.toString();
+  }
+}
diff --git a/libjava/classpath/gnu/regexp/REFilterInputStream.java b/libjava/classpath/gnu/regexp/REFilterInputStream.java
new file mode 100644
index 00000000000..485de56605d
--- /dev/null
+++ b/libjava/classpath/gnu/regexp/REFilterInputStream.java
@@ -0,0 +1,140 @@
+/* gnu/regexp/REFilterInputStream.java
+   Copyright (C) 1998-2001, 2004 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package gnu.regexp;
+import java.io.FilterInputStream;
+import java.io.InputStream;
+
+/**
+ * Replaces instances of a given RE found within an InputStream
+ * with replacement text.   The replacements are interpolated into the
+ * stream when a match is found.
+ *
+ * @author <A HREF="mailto:wes@cacas.org">Wes Biggs</A>
+ * @deprecated This class cannot properly handle all character
+ *             encodings.  For proper handling, use the REFilterReader
+ *             class instead.
+ */
+
+public class REFilterInputStream extends FilterInputStream {
+
+    private RE expr;
+    private String replace;
+    private String buffer;
+    private int bufpos;
+    private int offset;
+    private CharIndexedInputStream stream;
+
+  /**
+   * Creates an REFilterInputStream.  When reading from this stream,
+   * occurrences of patterns matching the supplied regular expression
+   * will be replaced with the supplied replacement text (the
+   * metacharacters $0 through $9 may be used to refer to the full
+   * match or subexpression matches).
+   *
+   * @param stream The InputStream to be filtered.
+   * @param expr The regular expression to search for.
+   * @param replace The text pattern to replace matches with.  
+   */
+  public REFilterInputStream(InputStream stream, RE expr, String replace) {
+    super(stream);
+    this.stream = new CharIndexedInputStream(stream,0);
+    this.expr = expr;
+    this.replace = replace;
+  }
+
+  /**
+   * Reads the next byte from the stream per the general contract of
+   * InputStream.read().  Returns -1 on error or end of stream.
+   */
+  public int read() {
+    // If we have buffered replace data, use it.
+    if ((buffer != null) && (bufpos < buffer.length())) {
+      return (int) buffer.charAt(bufpos++);
+    }
+
+    // check if input is at a valid position
+    if (!stream.isValid()) return -1;
+
+    REMatch mymatch = new REMatch(expr.getNumSubs(),offset,0);
+    if (expr.match(stream, mymatch)) {
+      mymatch.end[0] = mymatch.index;
+      mymatch.finish(stream);
+      stream.move(mymatch.toString().length());
+      offset += mymatch.toString().length();
+      buffer = mymatch.substituteInto(replace);
+      bufpos = 1;
+
+      // This is prone to infinite loops if replace string turns out empty.
+      if (buffer.length() > 0) {
+	  return buffer.charAt(0);
+      }
+    }
+    char ch = stream.charAt(0);
+    if (ch == CharIndexed.OUT_OF_BOUNDS) return -1;
+    stream.move(1);
+    offset++;
+    return ch;
+  }
+
+  /** 
+   * Returns false.  REFilterInputStream does not support mark() and
+   * reset() methods. 
+   */
+  public boolean markSupported() {
+    return false;
+  }
+
+  /** Reads from the stream into the provided array. */
+  public int read(byte[] b, int off, int len) {
+    int i;
+    int ok = 0;
+    while (len-- > 0) {
+      i = read();
+      if (i == -1) return (ok == 0) ? -1 : ok;
+      b[off++] = (byte) i;
+      ok++;
+    }
+    return ok;
+  }
+
+  /** Reads from the stream into the provided array. */
+  public int read(byte[] b) {
+    return read(b,0,b.length);
+  }
+}
diff --git a/libjava/classpath/gnu/regexp/REMatch.java b/libjava/classpath/gnu/regexp/REMatch.java
new file mode 100644
index 00000000000..cf25bb331c5
--- /dev/null
+++ b/libjava/classpath/gnu/regexp/REMatch.java
@@ -0,0 +1,263 @@
+/* gnu/regexp/REMatch.java
+   Copyright (C) 1998-2001, 2004 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package gnu.regexp;
+import java.io.Serializable;
+
+/**
+ * An instance of this class represents a match
+ * completed by a gnu.regexp matching function. It can be used
+ * to obtain relevant information about the location of a match
+ * or submatch.
+ *
+ * @author <A HREF="mailto:wes@cacas.org">Wes Biggs</A>
+ */
+public final class REMatch implements Serializable, Cloneable {
+    private String matchedText;
+
+    // These variables are package scope for fast access within the engine
+    int eflags; // execution flags this match was made using
+
+    // Offset in source text where match was tried.  This is zero-based;
+    // the actual position in the source text is given by (offset + anchor).
+    int offset;
+
+    // Anchor position refers to the index into the source input
+    // at which the matching operation began.
+    // This is also useful for the ANCHORINDEX option.
+    int anchor;
+
+    // Package scope; used by RE.
+    int index; // used while matching to mark current match position in input
+    int[] start; // start positions (relative to offset) for each (sub)exp.
+    int[] end;   // end positions for the same
+    REMatch next; // other possibility (to avoid having to use arrays)
+
+    public Object clone() {
+	try {
+	    REMatch copy = (REMatch) super.clone();
+	    copy.next = null;
+
+	    copy.start = (int[]) start.clone();
+	    copy.end = (int[]) end.clone();
+
+	    return copy;
+	} catch (CloneNotSupportedException e) {
+	    throw new Error(); // doesn't happen
+	}
+    }
+
+    void assignFrom(REMatch other) {
+	start = other.start;
+	end = other.end;
+	index = other.index;
+	// need to deep clone?
+	next = other.next;
+    }
+
+    REMatch(int subs, int anchor, int eflags) {
+	start = new int[subs+1];
+	end = new int[subs+1];
+	this.anchor = anchor;
+	this.eflags = eflags;
+	clear(anchor);
+    }
+
+    void finish(CharIndexed text) {
+	start[0] = 0;
+	StringBuffer sb = new StringBuffer();
+	int i;
+	for (i = 0; i < end[0]; i++)
+	    sb.append(text.charAt(i));
+	matchedText = sb.toString();
+	for (i = 0; i < start.length; i++) {
+	    // If any subexpressions didn't terminate, they don't count
+	    // TODO check if this code ever gets hit
+	    if ((start[i] == -1) ^ (end[i] == -1)) {
+		start[i] = -1;
+		end[i] = -1;
+	    }
+	}
+	next = null; // cut off alternates
+    }
+    
+    /** Clears the current match and moves the offset to the new index. */
+    void clear(int index) {
+	offset = index;
+	this.index = 0;
+	for (int i = 0; i < start.length; i++) {
+	    start[i] = end[i] = -1;
+	}
+	next = null; // cut off alternates
+    }
+    
+    /**
+     * Returns the string matching the pattern.  This makes it convenient
+     * to write code like the following:
+     * <P>
+     * <code> 
+     * REMatch myMatch = myExpression.getMatch(myString);<br>
+     * if (myMatch != null) System.out.println("Regexp found: "+myMatch);
+     * </code>
+     */
+    public String toString() {
+	return matchedText;
+    }
+    
+    /**
+     * Returns the index within the input text where the match in its entirety
+     * began.
+     */
+    public int getStartIndex() {
+	return offset + start[0];
+    }
+    
+    /**
+     * Returns the index within the input string where the match in
+     * its entirety ends.  The return value is the next position after
+     * the end of the string; therefore, a match created by the
+     * following call:
+     *
+     * <P>
+     * <code>REMatch myMatch = myExpression.getMatch(myString);</code>
+     * <P>
+     * can be viewed (given that myMatch is not null) by creating
+     * <P>
+     * <code>String theMatch = myString.substring(myMatch.getStartIndex(),
+     * myMatch.getEndIndex());</code>
+     * <P>
+     * But you can save yourself that work, since the <code>toString()</code>
+     * method (above) does exactly that for you.  
+     */
+    public int getEndIndex() {
+	return offset + end[0];
+    }
+  
+    /**
+     * Returns the string matching the given subexpression.  The subexpressions
+     * are indexed starting with one, not zero.  That is, the subexpression
+     * identified by the first set of parentheses in a regular expression
+     * could be retrieved from an REMatch by calling match.toString(1).
+     *
+     * @param sub Index of the subexpression.
+     */
+    public String toString(int sub) {
+	if ((sub >= start.length) || (start[sub] == -1)) return "";
+	return (matchedText.substring(start[sub],end[sub]));
+    }
+    
+    /** 
+     * Returns the index within the input string used to generate this match
+     * where subexpression number <i>sub</i> begins, or <code>-1</code> if
+     * the subexpression does not exist.  The initial position is zero.
+     *
+     * @param sub Subexpression index
+     * @deprecated Use getStartIndex(int) instead.
+     */
+    public int getSubStartIndex(int sub) {
+	if (sub >= start.length) return -1;
+	int x = start[sub];
+	return (x == -1) ? x : offset + x;
+    }
+    
+    /** 
+     * Returns the index within the input string used to generate this match
+     * where subexpression number <i>sub</i> begins, or <code>-1</code> if
+     * the subexpression does not exist.  The initial position is zero.
+     *
+     * @param sub Subexpression index
+     * @since gnu.regexp 1.1.0
+     */
+    public int getStartIndex(int sub) {
+	if (sub >= start.length) return -1;
+	int x = start[sub];
+	return (x == -1) ? x : offset + x;
+    }
+  
+    /** 
+     * Returns the index within the input string used to generate this match
+     * where subexpression number <i>sub</i> ends, or <code>-1</code> if
+     * the subexpression does not exist.  The initial position is zero.
+     *
+     * @param sub Subexpression index
+     * @deprecated Use getEndIndex(int) instead
+     */
+    public int getSubEndIndex(int sub) {
+	if (sub >= start.length) return -1;
+	int x = end[sub];
+	return (x == -1) ? x : offset + x;
+    }
+    
+    /** 
+     * Returns the index within the input string used to generate this match
+     * where subexpression number <i>sub</i> ends, or <code>-1</code> if
+     * the subexpression does not exist.  The initial position is zero.
+     *
+     * @param sub Subexpression index
+     */
+    public int getEndIndex(int sub) {
+	if (sub >= start.length) return -1;
+	int x = end[sub];
+	return (x == -1) ? x : offset + x;
+    }
+    
+    /**
+     * Substitute the results of this match to create a new string.
+     * This is patterned after PERL, so the tokens to watch out for are
+     * <code>$0</code> through <code>$9</code>.  <code>$0</code> matches
+     * the full substring matched; <code>$<i>n</i></code> matches
+     * subexpression number <i>n</i>.
+     *
+     * @param input A string consisting of literals and <code>$<i>n</i></code> tokens.
+     */
+    public String substituteInto(String input) {
+	// a la Perl, $0 is whole thing, $1 - $9 are subexpressions
+	StringBuffer output = new StringBuffer();
+	int pos;
+	for (pos = 0; pos < input.length()-1; pos++) {
+	    if ((input.charAt(pos) == '$') && (Character.isDigit(input.charAt(pos+1)))) {
+		int val = Character.digit(input.charAt(++pos),10);
+		if (val < start.length) {
+		    output.append(toString(val));
+		} 
+	    } else output.append(input.charAt(pos));
+	}
+	if (pos < input.length()) output.append(input.charAt(pos));
+	return output.toString();
+    }
+}
diff --git a/libjava/classpath/gnu/regexp/REMatchEnumeration.java b/libjava/classpath/gnu/regexp/REMatchEnumeration.java
new file mode 100644
index 00000000000..f164a69af4f
--- /dev/null
+++ b/libjava/classpath/gnu/regexp/REMatchEnumeration.java
@@ -0,0 +1,135 @@
+/* gnu/regexp/REMatchEnumeration.java
+   Copyright (C) 1998-2001, 2004 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+package gnu.regexp;
+import java.io.Serializable;
+import java.util.Enumeration;
+import java.util.NoSuchElementException;
+
+/**
+ * An REMatchEnumeration enumerates regular expression matches over a
+ * given input text.  You obtain a reference to an enumeration using
+ * the <code>getMatchEnumeration()</code> methods on an instance of
+ * RE. 
+ *
+ * <P>
+ *
+ * REMatchEnumeration does lazy computation; that is, it will not
+ * search for a match until it needs to.  If you'd rather just get all
+ * the matches at once in a big array, use the
+ * <code>getAllMatches()</code> methods on RE.  However, using an
+ * enumeration can help speed performance when the entire text does
+ * not need to be searched immediately.
+ *
+ * <P>
+ * 
+ * The enumerated type is especially useful when searching on a Reader
+ * or InputStream, because the InputStream read position cannot be
+ * guaranteed after calling <code>getMatch()</code> (see the
+ * description of that method for an explanation of why).  Enumeration
+ * also saves a lot of overhead required when calling
+ * <code>getMatch()</code> multiple times.
+ * 
+ * @author <A HREF="mailto:wes@cacas.org">Wes Biggs</A> 
+ */
+public class REMatchEnumeration implements Enumeration, Serializable {
+  private static final int YES = 1;
+  private static final int MAYBE = 0;
+  private static final int NO = -1;
+  
+  private int more;
+  private REMatch match;
+  private RE expr;
+  private CharIndexed input;
+  private int eflags;
+    private int index;
+
+  // Package scope constructor is used by RE.getMatchEnumeration()
+  REMatchEnumeration(RE expr, CharIndexed input, int index, int eflags) {
+    more = MAYBE;
+    this.expr = expr;
+    this.input = input;
+    this.index = index;
+    this.eflags = eflags;
+  }
+
+  /** Returns true if there are more matches in the input text. */
+  public boolean hasMoreElements() {
+    return hasMoreMatches(null);
+  }
+
+  /** Returns true if there are more matches in the input text. */
+  public boolean hasMoreMatches() {
+    return hasMoreMatches(null);
+  }
+
+  /** Returns true if there are more matches in the input text.
+   * Saves the text leading up to the match (or to the end of the input)
+   * in the specified buffer.
+   */
+  public boolean hasMoreMatches(StringBuffer buffer) {
+    if (more == MAYBE) {
+	match = expr.getMatchImpl(input,index,eflags,buffer);
+	if (match != null) {
+	    input.move((match.end[0] > 0) ? match.end[0] : 1);
+	    
+	    index = (match.end[0] > 0) ? match.end[0] + match.offset : index + 1;
+	    more = YES;
+	} else more = NO;
+    }
+    return (more == YES);
+  }
+
+  /** Returns the next match in the input text. */
+  public Object nextElement() throws NoSuchElementException {
+    return nextMatch();
+  }
+
+  /** 
+   * Returns the next match in the input text. This method is provided
+   * for convenience to avoid having to explicitly cast the return value
+   * to class REMatch.
+   */
+  public REMatch nextMatch() throws NoSuchElementException {
+    if (hasMoreElements()) {
+	more = (input.isValid()) ? MAYBE : NO;
+	return match;
+    }
+    throw new NoSuchElementException();
+  }
+}
+
diff --git a/libjava/classpath/gnu/regexp/RESyntax.java b/libjava/classpath/gnu/regexp/RESyntax.java
new file mode 100644
index 00000000000..7272b03481b
--- /dev/null
+++ b/libjava/classpath/gnu/regexp/RESyntax.java
@@ -0,0 +1,527 @@
+/* gnu/regexp/RESyntax.java
+   Copyright (C) 1998-2002, 2004 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package gnu.regexp;
+import java.io.Serializable;
+import java.util.BitSet;
+
+/**
+ * An RESyntax specifies the way a regular expression will be compiled.
+ * This class provides a number of predefined useful constants for
+ * emulating popular regular expression syntaxes.  Additionally the
+ * user may construct his or her own syntax, using any combination of the
+ * syntax bit constants.  The syntax is an optional argument to any of the
+ * matching methods on class RE.
+ *
+ * @author <A HREF="mailto:wes@cacas.org">Wes Biggs</A>
+ */
+
+public final class RESyntax implements Serializable {
+    static final String DEFAULT_LINE_SEPARATOR = System.getProperty("line.separator");
+
+    private static final String SYNTAX_IS_FINAL = RE.getLocalizedMessage("syntax.final");
+
+    private BitSet bits;
+
+    // true for the constant defined syntaxes
+    private boolean isFinal = false;
+
+    private String lineSeparator = DEFAULT_LINE_SEPARATOR;
+
+  // Values for constants are bit indexes
+
+  /**
+   * Syntax bit. Backslash is an escape character in lists.
+   */
+  public static final int RE_BACKSLASH_ESCAPE_IN_LISTS =  0;
+
+  /**
+   * Syntax bit. Use \? instead of ? and \+ instead of +.
+   */
+  public static final int RE_BK_PLUS_QM                =  1;
+
+  /**
+   * Syntax bit. POSIX character classes ([:...:]) in lists are allowed.
+   */
+  public static final int RE_CHAR_CLASSES              =  2;
+
+  /**
+   * Syntax bit. ^ and $ are special everywhere.
+   * <B>Not implemented.</B>
+   */
+  public static final int RE_CONTEXT_INDEP_ANCHORS     =  3; 
+
+  /**
+   * Syntax bit. Repetition operators are only special in valid positions.
+   * <B>Not implemented.</B>
+   */
+  public static final int RE_CONTEXT_INDEP_OPS         =  4; 
+
+  /**
+   * Syntax bit. Repetition and alternation operators are invalid
+   * at start and end of pattern and other places. 
+   * <B>Not implemented</B>.
+   */
+  public static final int RE_CONTEXT_INVALID_OPS       =  5; 
+
+  /**
+   * Syntax bit. Match-any-character operator (.) matches a newline.
+   */
+  public static final int RE_DOT_NEWLINE               =  6;
+
+  /**
+   * Syntax bit. Match-any-character operator (.) does not match a null.
+   */
+  public static final int RE_DOT_NOT_NULL              =  7;
+
+  /**
+   * Syntax bit. Intervals ({x}, {x,}, {x,y}) are allowed.
+   */
+  public static final int RE_INTERVALS                 =  8;
+
+  /**
+   * Syntax bit. No alternation (|), match one-or-more (+), or 
+   * match zero-or-one (?) operators.
+   */
+  public static final int RE_LIMITED_OPS               =  9;
+
+  /**
+   * Syntax bit. Newline is an alternation operator.
+   */
+  public static final int RE_NEWLINE_ALT               = 10; // impl.
+
+  /**
+   * Syntax bit. Intervals use { } instead of \{ \}
+   */
+  public static final int RE_NO_BK_BRACES              = 11; 
+
+  /**
+   * Syntax bit. Grouping uses ( ) instead of \( \).
+   */
+  public static final int RE_NO_BK_PARENS              = 12;
+
+  /**
+   * Syntax bit. Backreferences not allowed.
+   */
+  public static final int RE_NO_BK_REFS                = 13;
+
+  /**
+   * Syntax bit. Alternation uses | instead of \|
+   */
+  public static final int RE_NO_BK_VBAR                = 14;
+
+  /**
+   * Syntax bit. <B>Not implemented</B>.
+   */
+  public static final int RE_NO_EMPTY_RANGES           = 15;
+
+  /**
+   * Syntax bit. An unmatched right parenthesis (')' or '\)', depending
+   * on RE_NO_BK_PARENS) will throw an exception when compiling.
+   */
+  public static final int RE_UNMATCHED_RIGHT_PAREN_ORD = 16;
+
+  /**
+   * Syntax bit. <B>Not implemented.</B>
+   */
+  public static final int RE_HAT_LISTS_NOT_NEWLINE     = 17;
+
+  /**
+   * Syntax bit.  Stingy matching is allowed (+?, *?, ??, {x,y}?).
+   */
+  public static final int RE_STINGY_OPS                = 18;
+
+  /**
+   * Syntax bit. Allow character class escapes (\d, \D, \s, \S, \w, \W).
+   */
+  public static final int RE_CHAR_CLASS_ESCAPES        = 19;
+
+  /**
+   * Syntax bit. Allow use of (?:xxx) grouping (subexpression is not saved).
+   */
+  public static final int RE_PURE_GROUPING             = 20;
+
+  /**
+   * Syntax bit. Allow use of (?=xxx) and (?!xxx) apply the subexpression
+   * to the text following the current position without consuming that text.
+   */
+  public static final int RE_LOOKAHEAD                 = 21;
+
+  /**
+   * Syntax bit. Allow beginning- and end-of-string anchors (\A, \Z).
+   */
+  public static final int RE_STRING_ANCHORS            = 22;
+
+  /**
+   * Syntax bit. Allow embedded comments, (?#comment), as in Perl5.
+   */
+  public static final int RE_COMMENTS                  = 23;
+
+  /**
+   * Syntax bit. Allow character class escapes within lists, as in Perl5.
+   */
+  public static final int RE_CHAR_CLASS_ESC_IN_LISTS   = 24;
+
+  /**
+   * Syntax bit.  Possessive matching is allowed (++, *+, ?+, {x,y}+).
+   */
+  public static final int RE_POSSESSIVE_OPS            = 25;
+
+  private static final int BIT_TOTAL                   = 26;
+
+  /**
+   * Predefined syntax.
+   * Emulates regular expression support in the awk utility.
+   */
+  public static final RESyntax RE_SYNTAX_AWK;
+
+  /**
+   * Predefined syntax.
+   * Emulates regular expression support in the ed utility.
+   */
+  public static final RESyntax RE_SYNTAX_ED;
+
+  /**
+   * Predefined syntax.
+   * Emulates regular expression support in the egrep utility.
+   */
+  public static final RESyntax RE_SYNTAX_EGREP;
+
+  /**
+   * Predefined syntax.
+   * Emulates regular expression support in the GNU Emacs editor.
+   */
+  public static final RESyntax RE_SYNTAX_EMACS;
+
+  /**
+   * Predefined syntax.
+   * Emulates regular expression support in the grep utility.
+   */
+  public static final RESyntax RE_SYNTAX_GREP;
+
+  /**
+   * Predefined syntax.
+   * Emulates regular expression support in the POSIX awk specification.
+   */
+  public static final RESyntax RE_SYNTAX_POSIX_AWK;
+
+  /**
+   * Predefined syntax.
+   * Emulates POSIX basic regular expression support.
+   */
+  public static final RESyntax RE_SYNTAX_POSIX_BASIC;
+
+  /**
+   * Predefined syntax.
+   * Emulates regular expression support in the POSIX egrep specification.
+   */
+  public static final RESyntax RE_SYNTAX_POSIX_EGREP;
+
+  /**
+   * Predefined syntax.
+   * Emulates POSIX extended regular expression support.
+   */
+  public static final RESyntax RE_SYNTAX_POSIX_EXTENDED;
+
+  /**
+   * Predefined syntax.
+   * Emulates POSIX basic minimal regular expressions.
+   */
+  public static final RESyntax RE_SYNTAX_POSIX_MINIMAL_BASIC;
+
+  /**
+   * Predefined syntax.
+   * Emulates POSIX extended minimal regular expressions.
+   */
+  public static final RESyntax RE_SYNTAX_POSIX_MINIMAL_EXTENDED;
+
+  /**
+   * Predefined syntax.
+   * Emulates regular expression support in the sed utility.
+   */
+  public static final RESyntax RE_SYNTAX_SED;
+
+  /**
+   * Predefined syntax.
+   * Emulates regular expression support in Larry Wall's perl, version 4,
+   */
+  public static final RESyntax RE_SYNTAX_PERL4;
+
+  /**
+   * Predefined syntax.
+   * Emulates regular expression support in Larry Wall's perl, version 4,
+   * using single line mode (/s modifier).
+   */
+  public static final RESyntax RE_SYNTAX_PERL4_S; // single line mode (/s)
+
+  /**
+   * Predefined syntax.
+   * Emulates regular expression support in Larry Wall's perl, version 5.
+   */
+  public static final RESyntax RE_SYNTAX_PERL5;  
+
+  /**
+   * Predefined syntax.
+   * Emulates regular expression support in Larry Wall's perl, version 5,
+   * using single line mode (/s modifier).
+   */
+  public static final RESyntax RE_SYNTAX_PERL5_S;
+
+    /**
+     * Predefined syntax.
+     * Emulates regular expression support in Java 1.4's java.util.regex
+     * package.
+     */
+    public static final RESyntax RE_SYNTAX_JAVA_1_4;
+
+  static {
+      // Define syntaxes
+      
+      RE_SYNTAX_EMACS = new RESyntax().makeFinal();
+      
+      RESyntax RE_SYNTAX_POSIX_COMMON = new RESyntax()
+	  .set(RE_CHAR_CLASSES)
+	  .set(RE_DOT_NEWLINE)
+	  .set(RE_DOT_NOT_NULL)
+	  .set(RE_INTERVALS)
+	  .set(RE_NO_EMPTY_RANGES)
+	  .makeFinal();
+      
+      RE_SYNTAX_POSIX_BASIC = new RESyntax(RE_SYNTAX_POSIX_COMMON)
+	  .set(RE_BK_PLUS_QM)
+	  .makeFinal();
+      
+      RE_SYNTAX_POSIX_EXTENDED = new RESyntax(RE_SYNTAX_POSIX_COMMON)
+	  .set(RE_CONTEXT_INDEP_ANCHORS)
+	  .set(RE_CONTEXT_INDEP_OPS)
+	  .set(RE_NO_BK_BRACES)
+	  .set(RE_NO_BK_PARENS)
+	  .set(RE_NO_BK_VBAR)
+	  .set(RE_UNMATCHED_RIGHT_PAREN_ORD)
+	  .makeFinal();
+
+      RE_SYNTAX_AWK = new RESyntax()
+	  .set(RE_BACKSLASH_ESCAPE_IN_LISTS)
+	  .set(RE_DOT_NOT_NULL)
+	  .set(RE_NO_BK_PARENS)
+	  .set(RE_NO_BK_REFS)
+	  .set(RE_NO_BK_VBAR)
+	  .set(RE_NO_EMPTY_RANGES)
+	  .set(RE_UNMATCHED_RIGHT_PAREN_ORD)
+	  .makeFinal();
+      
+      RE_SYNTAX_POSIX_AWK = new RESyntax(RE_SYNTAX_POSIX_EXTENDED)
+	  .set(RE_BACKSLASH_ESCAPE_IN_LISTS)
+	  .makeFinal();
+      
+      RE_SYNTAX_GREP = new RESyntax()
+	  .set(RE_BK_PLUS_QM)
+	  .set(RE_CHAR_CLASSES)
+	  .set(RE_HAT_LISTS_NOT_NEWLINE)
+	  .set(RE_INTERVALS)
+	  .set(RE_NEWLINE_ALT)
+	  .makeFinal();
+      
+      RE_SYNTAX_EGREP = new RESyntax()
+	  .set(RE_CHAR_CLASSES)
+	  .set(RE_CONTEXT_INDEP_ANCHORS)
+	  .set(RE_CONTEXT_INDEP_OPS)
+	  .set(RE_HAT_LISTS_NOT_NEWLINE)
+	  .set(RE_NEWLINE_ALT)
+	  .set(RE_NO_BK_PARENS)
+	  .set(RE_NO_BK_VBAR)
+	  .makeFinal();
+    
+      RE_SYNTAX_POSIX_EGREP = new RESyntax(RE_SYNTAX_EGREP)
+	  .set(RE_INTERVALS)
+	  .set(RE_NO_BK_BRACES)
+	  .makeFinal();
+    
+      /* P1003.2/D11.2, section 4.20.7.1, lines 5078ff.  */
+    
+      RE_SYNTAX_ED = new RESyntax(RE_SYNTAX_POSIX_BASIC)
+	  .makeFinal();
+    
+      RE_SYNTAX_SED = new RESyntax(RE_SYNTAX_POSIX_BASIC)
+	  .makeFinal();
+      
+      RE_SYNTAX_POSIX_MINIMAL_BASIC = new RESyntax(RE_SYNTAX_POSIX_COMMON)
+	  .set(RE_LIMITED_OPS)
+	  .makeFinal();
+      
+      /* Differs from RE_SYNTAX_POSIX_EXTENDED in that RE_CONTEXT_INVALID_OPS
+	 replaces RE_CONTEXT_INDEP_OPS and RE_NO_BK_REFS is added. */
+      
+      RE_SYNTAX_POSIX_MINIMAL_EXTENDED = new RESyntax(RE_SYNTAX_POSIX_COMMON)
+	  .set(RE_CONTEXT_INDEP_ANCHORS)
+	  .set(RE_CONTEXT_INVALID_OPS)
+	  .set(RE_NO_BK_BRACES)
+	  .set(RE_NO_BK_PARENS)
+	  .set(RE_NO_BK_REFS)
+	  .set(RE_NO_BK_VBAR)
+	  .set(RE_UNMATCHED_RIGHT_PAREN_ORD)
+	  .makeFinal();
+      
+      /* There is no official Perl spec, but here's a "best guess" */
+      
+      RE_SYNTAX_PERL4 = new RESyntax()
+	  .set(RE_BACKSLASH_ESCAPE_IN_LISTS)
+	  .set(RE_CONTEXT_INDEP_ANCHORS)
+	  .set(RE_CONTEXT_INDEP_OPS)          // except for '{', apparently
+	  .set(RE_INTERVALS)
+	  .set(RE_NO_BK_BRACES)
+	  .set(RE_NO_BK_PARENS)
+	  .set(RE_NO_BK_VBAR)
+	  .set(RE_NO_EMPTY_RANGES)
+	  .set(RE_CHAR_CLASS_ESCAPES)    // \d,\D,\w,\W,\s,\S
+	  .makeFinal();
+      
+      RE_SYNTAX_PERL4_S = new RESyntax(RE_SYNTAX_PERL4)
+	  .set(RE_DOT_NEWLINE)
+	  .makeFinal();
+      
+      RE_SYNTAX_PERL5 = new RESyntax(RE_SYNTAX_PERL4)
+	  .set(RE_PURE_GROUPING)          // (?:)
+	  .set(RE_STINGY_OPS)             // *?,??,+?,{}?
+	  .set(RE_LOOKAHEAD)              // (?=)(?!)
+	  .set(RE_STRING_ANCHORS)         // \A,\Z
+	  .set(RE_CHAR_CLASS_ESC_IN_LISTS)// \d,\D,\w,\W,\s,\S within []
+	  .set(RE_COMMENTS)              // (?#)
+	  .makeFinal();
+      
+      RE_SYNTAX_PERL5_S = new RESyntax(RE_SYNTAX_PERL5)
+	  .set(RE_DOT_NEWLINE)
+	  .makeFinal();
+
+      RE_SYNTAX_JAVA_1_4 = new RESyntax(RE_SYNTAX_PERL5)
+	  // XXX
+	  .set(RE_POSSESSIVE_OPS)         // *+,?+,++,{}+
+	  .makeFinal();
+  }
+
+  /**
+   * Construct a new syntax object with all bits turned off.
+   * This is equivalent to RE_SYNTAX_EMACS.
+   */
+  public RESyntax() {
+    bits = new BitSet(BIT_TOTAL);
+  }
+
+    /**
+     * Called internally when constructing predefined syntaxes
+     * so their interpretation cannot vary.  Conceivably useful
+     * for your syntaxes as well.  Causes IllegalAccessError to
+     * be thrown if any attempt to modify the syntax is made.
+     *
+     * @return this object for convenient chaining
+     */
+    public RESyntax makeFinal() {
+	isFinal = true;
+	return this;
+    }
+
+  /**
+   * Construct a new syntax object with all bits set the same 
+   * as the other syntax.
+   */
+  public RESyntax(RESyntax other) {
+    bits = (BitSet) other.bits.clone();
+  }
+
+  /**
+   * Check if a given bit is set in this syntax.
+   */
+  public boolean get(int index) {
+    return bits.get(index);
+  }
+
+  /**
+   * Set a given bit in this syntax. 
+   *
+   * @param index the constant (RESyntax.RE_xxx) bit to set.
+   * @return a reference to this object for easy chaining.
+   */
+  public RESyntax set(int index) {
+      if (isFinal) throw new IllegalAccessError(SYNTAX_IS_FINAL);
+    bits.set(index);
+    return this;
+  }
+
+  /**
+   * Clear a given bit in this syntax. 
+   *
+   * @param index the constant (RESyntax.RE_xxx) bit to clear.
+   * @return a reference to this object for easy chaining.
+   */
+  public RESyntax clear(int index) {
+      if (isFinal) throw new IllegalAccessError(SYNTAX_IS_FINAL);
+      bits.clear(index);
+      return this;
+  }
+
+    /**
+     * Changes the line separator string for regular expressions
+     * created using this RESyntax.  The default separator is the
+     * value returned by the system property "line.separator", which
+     * should be correct when reading platform-specific files from a
+     * filesystem.  However, many programs may collect input from
+     * sources where the line separator is differently specified (for
+     * example, in the applet environment, the text box widget
+     * interprets line breaks as single-character newlines,
+     * regardless of the host platform.
+     *
+     * Note that setting the line separator to a character or
+     * characters that have specific meaning within the current syntax
+     * can cause unexpected chronosynclastic infundibula.
+     *
+     * @return this object for convenient chaining 
+     */
+    public RESyntax setLineSeparator(String aSeparator) {
+	if (isFinal) throw new IllegalAccessError(SYNTAX_IS_FINAL);
+	lineSeparator = aSeparator;
+	return this;
+    }
+
+    /**
+     * Returns the currently active line separator string.  The default
+     * is the platform-dependent system property "line.separator".
+     */
+    public String getLineSeparator() {
+	return lineSeparator;
+    }
+}
diff --git a/libjava/classpath/gnu/regexp/REToken.java b/libjava/classpath/gnu/regexp/REToken.java
new file mode 100644
index 00000000000..4eae9ec473c
--- /dev/null
+++ b/libjava/classpath/gnu/regexp/REToken.java
@@ -0,0 +1,86 @@
+/* gnu/regexp/REToken.java
+   Copyright (C) 1998-2001, 2004 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+package gnu.regexp;
+import java.io.Serializable;
+
+abstract class REToken implements Serializable {
+
+  protected REToken next = null;
+  protected REToken uncle = null;
+  protected int subIndex;
+
+  protected REToken(int subIndex) {
+      this.subIndex = subIndex;
+  }
+
+  int getMinimumLength() {
+    return 0;
+  }
+
+  void setUncle(REToken anUncle) {
+    uncle = anUncle;
+  }
+
+    /** Returns true if the match succeeded, false if it failed. */
+    abstract boolean match(CharIndexed input, REMatch mymatch);
+  
+    /** Returns true if the rest of the tokens match, false if they fail. */
+    protected boolean next(CharIndexed input, REMatch mymatch) {
+	if (next == null) {
+	    if (uncle == null) {
+		return true;
+	    } else {
+		return uncle.match(input, mymatch);
+	    }
+	} else {
+	    return next.match(input, mymatch);
+	}
+    }
+  
+  boolean chain(REToken token) {
+      next = token;
+      return true; // Token was accepted
+  }
+
+    abstract void dump(StringBuffer os);
+
+  void dumpAll(StringBuffer os) {
+    dump(os);
+    if (next != null) next.dumpAll(os);
+  }
+}
diff --git a/libjava/classpath/gnu/regexp/RETokenAny.java b/libjava/classpath/gnu/regexp/RETokenAny.java
new file mode 100644
index 00000000000..ac032dcb3bf
--- /dev/null
+++ b/libjava/classpath/gnu/regexp/RETokenAny.java
@@ -0,0 +1,73 @@
+/* gnu/regexp/RETokenAny.java
+   Copyright (C) 1998-2001, 2004 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package gnu.regexp;
+
+final class RETokenAny extends REToken {
+  /** True if '.' can match a newline (RE_DOT_NEWLINE) */
+  private boolean newline; 
+
+  /** True if '.' can't match a null (RE_DOT_NOT_NULL) */
+  private boolean matchNull;    
+  
+  RETokenAny(int subIndex, boolean newline, boolean matchNull) { 
+    super(subIndex);
+    this.newline = newline;
+    this.matchNull = matchNull;
+  }
+
+  int getMinimumLength() {
+    return 1;
+  }
+
+    boolean match(CharIndexed input, REMatch mymatch) {
+    char ch = input.charAt(mymatch.index);
+    if ((ch == CharIndexed.OUT_OF_BOUNDS)
+	|| (!newline && (ch == '\n'))
+	|| (matchNull && (ch == 0))) {
+	return false;
+    }
+    ++mymatch.index;
+    return next(input, mymatch);
+  }
+
+  void dump(StringBuffer os) {
+    os.append('.');
+  }
+}
+
diff --git a/libjava/classpath/gnu/regexp/RETokenBackRef.java b/libjava/classpath/gnu/regexp/RETokenBackRef.java
new file mode 100644
index 00000000000..674822abd70
--- /dev/null
+++ b/libjava/classpath/gnu/regexp/RETokenBackRef.java
@@ -0,0 +1,72 @@
+/* gnu/regexp/RETokenBackRef.java
+   Copyright (C) 1998-2001, 2004 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package gnu.regexp;
+
+final class RETokenBackRef extends REToken {
+  private int num;
+  private boolean insens;
+  
+  RETokenBackRef(int subIndex, int num, boolean insens) {
+    super(subIndex);
+    this.num = num;
+    this.insens = insens;
+  }
+
+  // should implement getMinimumLength() -- any ideas?
+
+    boolean match(CharIndexed input, REMatch mymatch) {
+	int b,e;
+	b = mymatch.start[num];
+	e = mymatch.end[num];
+	if ((b==-1)||(e==-1)) return false; // this shouldn't happen, but...
+	for (int i=b; i<e; i++) {
+	    if (input.charAt(mymatch.index+i-b) != input.charAt(i)) {
+		return false;
+	    }
+	}
+	mymatch.index += e-b;
+	return next(input, mymatch);
+    }
+    
+    void dump(StringBuffer os) {
+	os.append('\\').append(num);
+    }
+}
+
+
diff --git a/libjava/classpath/gnu/regexp/RETokenChar.java b/libjava/classpath/gnu/regexp/RETokenChar.java
new file mode 100644
index 00000000000..a15449b2d96
--- /dev/null
+++ b/libjava/classpath/gnu/regexp/RETokenChar.java
@@ -0,0 +1,91 @@
+/* gnu/regexp/RETokenChar.java
+   Copyright (C) 1998-2001, 2004 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package gnu.regexp;
+
+final class RETokenChar extends REToken {
+  private char[] ch;
+  private boolean insens;
+
+  RETokenChar(int subIndex, char c, boolean ins) {
+    super(subIndex);
+    ch = new char [1];
+    ch[0] = (insens = ins) ? Character.toLowerCase(c) : c;
+  }
+
+  int getMinimumLength() {
+    return ch.length;
+  }
+  
+    boolean match(CharIndexed input, REMatch mymatch) {
+	int z = ch.length;
+	char c;
+	for (int i=0; i<z; i++) {
+	    c = input.charAt(mymatch.index+i);
+	    if (( (insens) ? Character.toLowerCase(c) : c ) != ch[i]) {
+		return false;
+	    }
+	}
+	mymatch.index += z;
+
+	return next(input, mymatch);
+    }
+
+  // Overrides REToken.chain() to optimize for strings
+  boolean chain(REToken next) {
+    if (next instanceof RETokenChar) {
+      RETokenChar cnext = (RETokenChar) next;
+      // assume for now that next can only be one character
+      int newsize = ch.length + cnext.ch.length;
+      
+      char[] chTemp = new char [newsize];
+      
+      System.arraycopy(ch,0,chTemp,0,ch.length);
+      System.arraycopy(cnext.ch,0,chTemp,ch.length,cnext.ch.length);
+      
+      ch = chTemp;
+      return false;
+    } else return super.chain(next);
+  }
+
+  void dump(StringBuffer os) {
+    os.append(ch);
+  }
+}
+
+
diff --git a/libjava/classpath/gnu/regexp/RETokenEnd.java b/libjava/classpath/gnu/regexp/RETokenEnd.java
new file mode 100644
index 00000000000..70483b746a9
--- /dev/null
+++ b/libjava/classpath/gnu/regexp/RETokenEnd.java
@@ -0,0 +1,75 @@
+/* gnu/regexp/RETokenEnd.java
+   Copyright (C) 1998-2001, 2004 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package gnu.regexp;
+
+final class RETokenEnd extends REToken {
+    /**
+     * Indicates whether this token should match on a line break.
+     */
+  private String newline;
+
+  RETokenEnd(int subIndex,String newline) { 
+    super(subIndex);
+    this.newline = newline;
+  }
+
+    boolean match(CharIndexed input, REMatch mymatch) {
+	char ch = input.charAt(mymatch.index);
+	if (ch == CharIndexed.OUT_OF_BOUNDS)
+	    return ((mymatch.eflags & RE.REG_NOTEOL)>0) ? 
+		false : next(input, mymatch);
+	if (newline != null) {
+	    char z;
+	    int i = 0; // position in newline
+	    do {
+		z = newline.charAt(i);
+		if (ch != z) return false;
+		++i;
+		ch = input.charAt(mymatch.index + i);
+	    } while (i < newline.length());
+	    
+	    return next(input, mymatch);
+	}
+	return false;
+    }
+
+  void dump(StringBuffer os) {
+    os.append('$');
+  }
+}
diff --git a/libjava/classpath/gnu/regexp/RETokenEndSub.java b/libjava/classpath/gnu/regexp/RETokenEndSub.java
new file mode 100644
index 00000000000..f3bb4f2e131
--- /dev/null
+++ b/libjava/classpath/gnu/regexp/RETokenEndSub.java
@@ -0,0 +1,53 @@
+/* gnu/regexp/RETokenEndSub.java
+   Copyright (C) 2001, 2004 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+package gnu.regexp;
+
+final class RETokenEndSub extends REToken {
+    RETokenEndSub(int subIndex) {
+	super(subIndex);
+    }
+    
+    boolean match(CharIndexed input, REMatch mymatch) {
+	mymatch.end[subIndex] = mymatch.index;
+	return next(input, mymatch);
+    }
+    
+    void dump(StringBuffer os) {
+	// handled by RE
+    }
+}
diff --git a/libjava/classpath/gnu/regexp/RETokenLookAhead.java b/libjava/classpath/gnu/regexp/RETokenLookAhead.java
new file mode 100644
index 00000000000..33eaec9fac1
--- /dev/null
+++ b/libjava/classpath/gnu/regexp/RETokenLookAhead.java
@@ -0,0 +1,87 @@
+/* gnu/regexp/RETokenLookAhead.java
+   Copyright (C) 1998-2001, 2004 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+package gnu.regexp;
+
+/**
+ * @since gnu.regexp 1.1.3
+ * @author Shashank Bapat
+ */
+final class RETokenLookAhead extends REToken
+{
+  REToken re;
+  boolean negative;
+
+  RETokenLookAhead(REToken re, boolean negative) throws REException {
+    super(0);
+    this.re = re;
+    this.negative = negative;
+  }
+
+  boolean match(CharIndexed input, REMatch mymatch)
+  {
+    REMatch trymatch = (REMatch)mymatch.clone();
+    REMatch trymatch1 = (REMatch)mymatch.clone();
+    REMatch newMatch = null;
+    if (re.match(input, trymatch)) {
+      if (negative) return false;
+      if (next(input, trymatch1))
+        newMatch = trymatch1;
+    }
+
+    if (newMatch != null) {
+      if (negative) return false;
+      //else
+      mymatch.assignFrom(newMatch);
+      return true;
+    }
+    else { // no match
+      if (negative)
+        return next(input, mymatch);
+      //else
+      return false;
+    }
+  }
+
+    void dump(StringBuffer os) {
+	os.append("(?");
+	os.append(negative ? '!' : '=');
+	re.dumpAll(os);
+	os.append(')');
+    }
+}
+
diff --git a/libjava/classpath/gnu/regexp/RETokenOneOf.java b/libjava/classpath/gnu/regexp/RETokenOneOf.java
new file mode 100644
index 00000000000..3f6e89e2103
--- /dev/null
+++ b/libjava/classpath/gnu/regexp/RETokenOneOf.java
@@ -0,0 +1,130 @@
+/* gnu/regexp/RETokenOneOf.java
+   Copyright (C) 1998-2001, 2004 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+package gnu.regexp;
+import java.util.Vector;
+
+final class RETokenOneOf extends REToken {
+  private Vector options;
+  private boolean negative;
+
+  // This constructor is used for convenience when we know the set beforehand,
+  // e.g. \d --> new RETokenOneOf("0123456789",false, ..)
+  //      \D --> new RETokenOneOf("0123456789",true, ..)
+
+  RETokenOneOf(int subIndex, String optionsStr, boolean negative, boolean insens) {
+    super(subIndex);
+    options = new Vector();
+    this.negative = negative;
+    for (int i = 0; i < optionsStr.length(); i++)
+      options.addElement(new RETokenChar(subIndex,optionsStr.charAt(i),insens));
+  }
+
+  RETokenOneOf(int subIndex, Vector options, boolean negative) {
+    super(subIndex);
+    this.options = options;
+    this.negative = negative;
+  }
+
+  int getMinimumLength() {
+    int min = Integer.MAX_VALUE;
+    int x;
+    for (int i=0; i < options.size(); i++) {
+      if ((x = ((REToken) options.elementAt(i)).getMinimumLength()) < min)
+	min = x;
+    }
+    return min;
+  }
+
+    boolean match(CharIndexed input, REMatch mymatch) {
+    if (negative && (input.charAt(mymatch.index) == CharIndexed.OUT_OF_BOUNDS)) 
+      return false;
+
+    REMatch newMatch = null;
+    REMatch last = null;
+    REToken tk;
+    boolean isMatch;
+    for (int i=0; i < options.size(); i++) {
+	tk = (REToken) options.elementAt(i);
+	REMatch tryMatch = (REMatch) mymatch.clone();
+	if (tk.match(input, tryMatch)) { // match was successful
+	    if (negative) return false;
+
+	    if (next(input, tryMatch)) {
+		// Add tryMatch to list of possibilities.
+		if (last == null) {
+		    newMatch = tryMatch;
+		    last = tryMatch;
+		} else {
+		    last.next = tryMatch;
+		    last = tryMatch;
+		}
+	    } // next succeeds
+	} // is a match
+    } // try next option
+
+    if (newMatch != null) {
+	if (negative) {
+	    return false;
+	} else {
+	    // set contents of mymatch equal to newMatch
+
+	    // try each one that matched
+	    mymatch.assignFrom(newMatch);
+	    return true;
+	}
+    } else {
+	if (negative) {
+	    ++mymatch.index;
+	    return next(input, mymatch);
+	} else {
+	    return false;
+	}
+    }
+
+    // index+1 works for [^abc] lists, not for generic lookahead (--> index)
+  }
+
+  void dump(StringBuffer os) {
+    os.append(negative ? "[^" : "(?:");
+    for (int i = 0; i < options.size(); i++) {
+      if (!negative && (i > 0)) os.append('|');
+      ((REToken) options.elementAt(i)).dumpAll(os);
+    }
+    os.append(negative ? ']' : ')');
+  }  
+}
diff --git a/libjava/classpath/gnu/regexp/RETokenPOSIX.java b/libjava/classpath/gnu/regexp/RETokenPOSIX.java
new file mode 100644
index 00000000000..bbb8066bca8
--- /dev/null
+++ b/libjava/classpath/gnu/regexp/RETokenPOSIX.java
@@ -0,0 +1,144 @@
+/* gnu/regexp/RETokenPOSIX.java
+   Copyright (C) 1998-2001, 2004 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package gnu.regexp;
+
+final class RETokenPOSIX extends REToken {
+  int type;
+  boolean insens;
+  boolean negated;
+
+  static final int  ALNUM = 0;
+  static final int  ALPHA = 1;
+  static final int  BLANK = 2;
+  static final int  CNTRL = 3;
+  static final int  DIGIT = 4;
+  static final int  GRAPH = 5;
+  static final int  LOWER = 6;
+  static final int  PRINT = 7;
+  static final int  PUNCT = 8;
+  static final int  SPACE = 9;
+  static final int  UPPER = 10;
+  static final int XDIGIT = 11;
+
+  // Array indices correspond to constants defined above.
+  static final String[] s_nameTable =  {
+    "alnum", "alpha", "blank", "cntrl", "digit", "graph", "lower",
+    "print", "punct", "space", "upper", "xdigit" 
+  };
+
+  // The RE constructor uses this to look up the constant for a string
+  static int intValue(String key) {
+    for (int i = 0; i < s_nameTable.length; i++) {
+      if (s_nameTable[i].equals(key)) return i;
+    }
+    return -1;
+  }
+
+  RETokenPOSIX(int subIndex, int type, boolean insens, boolean negated) {
+    super(subIndex);
+    this.type = type;
+    this.insens = insens;
+    this.negated = negated;
+  }
+
+    int getMinimumLength() {
+	return 1;
+    }
+
+    boolean match(CharIndexed input, REMatch mymatch) {
+    char ch = input.charAt(mymatch.index);
+    if (ch == CharIndexed.OUT_OF_BOUNDS)
+      return false;
+    
+    boolean retval = false;
+    switch (type) {
+    case ALNUM:
+	// Note that there is some debate over whether '_' should be included
+	retval = Character.isLetterOrDigit(ch) || (ch == '_');
+	break;
+    case ALPHA:
+	retval = Character.isLetter(ch);
+	break;
+    case BLANK:
+	retval = ((ch == ' ') || (ch == '\t'));
+	break;
+    case CNTRL:
+	retval = Character.isISOControl(ch);
+	break;
+    case DIGIT:
+	retval = Character.isDigit(ch);
+	break;
+    case GRAPH:
+	retval = (!(Character.isWhitespace(ch) || Character.isISOControl(ch)));
+	break;
+    case LOWER:
+	retval = ((insens && Character.isLetter(ch)) || Character.isLowerCase(ch));
+	break;
+    case PRINT:
+	retval = (!(Character.isWhitespace(ch) || Character.isISOControl(ch)))
+	    || (ch == ' ');
+	break;
+    case PUNCT:
+	// This feels sloppy, especially for non-U.S. locales.
+	retval = ("`~!@#$%^&*()-_=+[]{}\\|;:'\"/?,.<>".indexOf(ch)!=-1);
+	break;
+    case SPACE:
+	retval = Character.isWhitespace(ch);
+	break;
+    case UPPER:
+	retval = ((insens && Character.isLetter(ch)) || Character.isUpperCase(ch));
+	break;
+    case XDIGIT:
+	retval = (Character.isDigit(ch) || ("abcdefABCDEF".indexOf(ch)!=-1));
+	break;
+    }
+
+    if (negated) retval = !retval;
+    if (retval) {
+	++mymatch.index;
+	return next(input, mymatch);
+    }
+    else return false;
+  }
+
+  void dump(StringBuffer os) {
+    if (negated) os.append('^');
+    os.append("[:" + s_nameTable[type] + ":]");
+  }
+}
diff --git a/libjava/classpath/gnu/regexp/RETokenRange.java b/libjava/classpath/gnu/regexp/RETokenRange.java
new file mode 100644
index 00000000000..dadaf2d8072
--- /dev/null
+++ b/libjava/classpath/gnu/regexp/RETokenRange.java
@@ -0,0 +1,69 @@
+/* gnu/regexp/RETokenRange.java
+   Copyright (C) 1998-2001, 2004 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+package gnu.regexp;
+
+final class RETokenRange extends REToken {
+  private char lo, hi;
+  private boolean insens;
+
+  RETokenRange(int subIndex, char lo, char hi, boolean ins) {
+    super(subIndex);
+    this.lo = (insens = ins) ? Character.toLowerCase(lo) : lo;
+    this.hi = ins ? Character.toLowerCase(hi) : hi;
+  }
+
+  int getMinimumLength() {
+    return 1;
+  }
+
+    boolean match(CharIndexed input, REMatch mymatch) {
+	char c = input.charAt(mymatch.index);
+	if (c == CharIndexed.OUT_OF_BOUNDS) return false;
+	if (insens) c = Character.toLowerCase(c);
+	if ((c >= lo) && (c <= hi)) {
+	    ++mymatch.index;
+	    return next(input, mymatch);
+	}
+	return false;
+    }
+    
+  void dump(StringBuffer os) {
+    os.append(lo).append('-').append(hi);
+  }
+}
+
diff --git a/libjava/classpath/gnu/regexp/RETokenRepeated.java b/libjava/classpath/gnu/regexp/RETokenRepeated.java
new file mode 100644
index 00000000000..3165a6f1654
--- /dev/null
+++ b/libjava/classpath/gnu/regexp/RETokenRepeated.java
@@ -0,0 +1,240 @@
+/* gnu/regexp/RETokenRepeated.java
+   Copyright (C) 1998-2001, 2004 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package gnu.regexp;
+
+import java.util.Vector;
+
+final class RETokenRepeated extends REToken {
+    private REToken token;
+    private int min,max;
+    private boolean stingy;
+    private boolean possessive;
+    
+    RETokenRepeated(int subIndex, REToken token, int min, int max) {
+	super(subIndex);
+	this.token = token;
+	this.min = min;
+	this.max = max;
+    }
+
+    /** Sets the minimal matching mode to true. */
+    void makeStingy() {
+	stingy = true;
+    }
+    
+    /** Queries if this token has minimal matching enabled. */
+    boolean isStingy() {
+	return stingy;
+    }
+
+    /** Sets possessive matching mode to true. */
+    void makePossessive() {
+        possessive = true;
+    }
+
+    /** Queries if this token has possessive matching enabled. */
+    boolean isPossessive() {
+        return possessive;
+    }
+    
+    /**
+     * The minimum length of a repeated token is the minimum length
+     * of the token multiplied by the minimum number of times it must
+     * match.
+     */
+    int getMinimumLength() {
+	return (min * token.getMinimumLength());
+    }
+
+    // We do need to save every possible point, but the number of clone()
+    // invocations here is really a killer for performance on non-stingy
+    // repeat operators.  I'm open to suggestions...
+
+    // Hypothetical question: can you have a RE that matches 1 times,
+    // 3 times, 5 times, but not 2 times or 4 times?  Does having
+    // the subexpression back-reference operator allow that?
+
+    boolean match(CharIndexed input, REMatch mymatch) {
+	// number of times we've matched so far
+	int numRepeats = 0; 
+	
+	// Possible positions for the next repeat to match at
+	REMatch newMatch = mymatch;
+	REMatch last = null;
+	REMatch current;
+
+	// Add the '0-repeats' index
+	// positions.elementAt(z) == position [] in input after <<z>> matches
+	Vector positions = new Vector();
+	positions.addElement(newMatch);
+	
+	// Declare variables used in loop
+	REMatch doables;
+	REMatch doablesLast;
+	REMatch recurrent;
+
+	do {
+	    // Check for stingy match for each possibility.
+	    if (stingy && (numRepeats >= min)) {
+		REMatch result = matchRest(input, newMatch);
+		if (result != null) {
+		    mymatch.assignFrom(result);
+		    return true;
+		}
+	    }
+
+	    doables = null;
+	    doablesLast = null;
+
+	    // try next repeat at all possible positions
+	    for (current = newMatch; current != null; current = current.next) {
+		recurrent = (REMatch) current.clone();
+		if (token.match(input, recurrent)) {
+		    // add all items in current to doables array
+		    if (doables == null) {
+			doables = recurrent;
+			doablesLast = recurrent;
+		    } else {
+			// Order these from longest to shortest
+			// Start by assuming longest (more repeats)
+			doablesLast.next = recurrent;
+		    }
+		    // Find new doablesLast
+		    while (doablesLast.next != null) {
+			doablesLast = doablesLast.next;
+		    }
+		}
+	    }
+	    // if none of the possibilities worked out, break out of do/while
+	    if (doables == null) break;
+	    
+	    // reassign where the next repeat can match
+	    newMatch = doables;
+	    
+	    // increment how many repeats we've successfully found
+	    ++numRepeats;
+	    
+	    positions.addElement(newMatch);
+	} while (numRepeats < max);
+	
+	// If there aren't enough repeats, then fail
+	if (numRepeats < min) return false;
+	
+	// We're greedy, but ease off until a true match is found 
+	int posIndex = positions.size();
+	
+	// At this point we've either got too many or just the right amount.
+	// See if this numRepeats works with the rest of the regexp.
+	REMatch allResults = null;
+	REMatch allResultsLast = null;
+
+	REMatch results = null;
+	while (--posIndex >= min) {
+	    newMatch = (REMatch) positions.elementAt(posIndex);
+	    results = matchRest(input, newMatch);
+	    if (results != null) {
+		if (allResults == null) {
+		    allResults = results;
+		    allResultsLast = results;
+		} else {
+		    // Order these from longest to shortest
+		    // Start by assuming longest (more repeats)
+		    allResultsLast.next = results;
+		}
+		// Find new doablesLast
+		while (allResultsLast.next != null) {
+		    allResultsLast = allResultsLast.next;
+		}
+	    }
+	    // else did not match rest of the tokens, try again on smaller sample
+	    // or break out when performing possessive matching
+	    if (possessive) break;
+	}
+	if (allResults != null) {
+	    mymatch.assignFrom(allResults); // does this get all?
+	    return true;
+	}
+	// If we fall out, no matches.
+	return false;
+    }
+
+    private REMatch matchRest(CharIndexed input, final REMatch newMatch) {
+	REMatch current, single;
+	REMatch doneIndex = null;
+	REMatch doneIndexLast = null;
+	// Test all possible matches for this number of repeats
+	for (current = newMatch; current != null; current = current.next) {
+	    // clone() separates a single match from the chain
+	    single = (REMatch) current.clone();
+	    if (next(input, single)) {
+		// chain results to doneIndex
+		if (doneIndex == null) {
+		    doneIndex = single;
+		    doneIndexLast = single;
+		} else {
+		    doneIndexLast.next = single;
+		}
+		// Find new doneIndexLast
+		while (doneIndexLast.next != null) {
+		    doneIndexLast = doneIndexLast.next;
+		}
+	    }
+	}
+	return doneIndex;
+    }
+
+    void dump(StringBuffer os) {
+	os.append("(?:");
+	token.dumpAll(os);
+	os.append(')');
+	if ((max == Integer.MAX_VALUE) && (min <= 1))
+	    os.append( (min == 0) ? '*' : '+' );
+	else if ((min == 0) && (max == 1))
+	    os.append('?');
+	else {
+	    os.append('{').append(min);
+	    if (max > min) {
+		os.append(',');
+		if (max != Integer.MAX_VALUE) os.append(max);
+	    }
+	    os.append('}');
+	}
+	if (stingy) os.append('?');
+    }
+}
diff --git a/libjava/classpath/gnu/regexp/RETokenStart.java b/libjava/classpath/gnu/regexp/RETokenStart.java
new file mode 100644
index 00000000000..8f7198237e1
--- /dev/null
+++ b/libjava/classpath/gnu/regexp/RETokenStart.java
@@ -0,0 +1,87 @@
+/*  gnu/regexp/RETokenStart.java
+    Copyright (C) 1998-2001, 2004 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+package gnu.regexp;
+
+class RETokenStart extends REToken {
+    private String newline; // matches after a newline
+    
+    RETokenStart(int subIndex, String newline) {
+	super(subIndex);
+	this.newline = newline;
+    }
+    
+    boolean match(CharIndexed input, REMatch mymatch) {
+	// charAt(index-n) may be unknown on a Reader/InputStream. FIXME
+	// Match after a newline if in multiline mode
+	
+	if (newline != null) {
+	    int len = newline.length();
+	    if (mymatch.offset >= len) {
+		boolean found = true;
+		char z;
+		int i = 0; // position in REToken.newline
+		char ch = input.charAt(mymatch.index - len);
+		do {
+		    z = newline.charAt(i);
+		    if (ch != z) {
+			found = false;
+			break;
+		    }
+		    ++i;
+		    ch = input.charAt(mymatch.index - len + i);
+		} while (i < len);
+	    
+		if (found) return next(input, mymatch);
+	    }
+	}
+	
+	// Don't match at all if REG_NOTBOL is set.
+	if ((mymatch.eflags & RE.REG_NOTBOL) > 0) return false;
+	
+	if ((mymatch.eflags & RE.REG_ANCHORINDEX) > 0)
+	    return (mymatch.anchor == mymatch.offset) ? 
+		next(input, mymatch) : false;
+	else
+	    return ((mymatch.index == 0) && (mymatch.offset == 0)) ?
+		next(input, mymatch) : false;
+    }
+    
+    void dump(StringBuffer os) {
+	os.append('^');
+    }
+}
diff --git a/libjava/classpath/gnu/regexp/RETokenWordBoundary.java b/libjava/classpath/gnu/regexp/RETokenWordBoundary.java
new file mode 100644
index 00000000000..6804151e261
--- /dev/null
+++ b/libjava/classpath/gnu/regexp/RETokenWordBoundary.java
@@ -0,0 +1,104 @@
+/* gnu/regexp/RETokenWordBoundary.java
+   Copyright (C) 2001, 2004 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package gnu.regexp;
+
+/**
+ * Represents a combination lookahead/lookbehind for POSIX [:alnum:].
+ */
+final class RETokenWordBoundary extends REToken {
+    private boolean negated;
+    private int where;
+    static final int BEGIN = 1;
+    static final int END = 2;
+
+    RETokenWordBoundary(int subIndex, int where, boolean negated) {
+	super(subIndex);
+	this.where = where;
+	this.negated = negated;
+    }
+    
+    boolean match(CharIndexed input, REMatch mymatch) {
+	// Word boundary means input[index-1] was a word character
+	// and input[index] is not, or input[index] is a word character
+	// and input[index-1] was not
+	//  In the string "one two three", these positions match:
+	//  |o|n|e| |t|w|o| |t|h|r|e|e|
+	//  ^     ^ ^     ^ ^         ^
+	boolean after = false;  // is current character a letter or digit?
+	boolean before = false; // is previous character a letter or digit?
+	char ch;
+
+	// TODO: Also check REG_ANCHORINDEX vs. anchor
+	if (((mymatch.eflags & RE.REG_ANCHORINDEX) != RE.REG_ANCHORINDEX) 
+	    || (mymatch.offset + mymatch.index > mymatch.anchor)) {
+	    if ((ch = input.charAt(mymatch.index - 1)) != CharIndexed.OUT_OF_BOUNDS) {
+		before = Character.isLetterOrDigit(ch) || (ch == '_');
+	    }
+	}
+
+	if ((ch = input.charAt(mymatch.index)) != CharIndexed.OUT_OF_BOUNDS) {
+	    after = Character.isLetterOrDigit(ch) || (ch == '_');
+	}
+
+	// if (before) and (!after), we're at end (\>)
+	// if (after) and (!before), we're at beginning (\<)
+	boolean doNext = false;
+
+	if ((where & BEGIN) == BEGIN) {
+	    doNext = after && !before;
+	}
+	if ((where & END) == END) {
+	    doNext ^= before && !after;
+	}
+
+	if (negated) doNext = !doNext;
+
+	return (doNext ? next(input, mymatch) : false);
+    }
+    
+    void dump(StringBuffer os) {
+	if (where == (BEGIN | END)) {
+	    os.append( negated ? "\\B" : "\\b" );
+	} else if (where == BEGIN) {
+	    os.append("\\<");
+	} else {
+	    os.append("\\>");
+	}
+    }
+}
diff --git a/libjava/classpath/gnu/regexp/UncheckedRE.java b/libjava/classpath/gnu/regexp/UncheckedRE.java
new file mode 100644
index 00000000000..e6712113828
--- /dev/null
+++ b/libjava/classpath/gnu/regexp/UncheckedRE.java
@@ -0,0 +1,109 @@
+/* gnu/regexp/UncheckedRE.java
+   Copyright (C) 2001, 2004 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+package gnu.regexp;
+
+/**
+ * UncheckedRE is a subclass of RE that allows programmers an easier means
+ * of programmatically precompiling regular expressions.  It is constructed
+ * and used in exactly the same manner as an instance of the RE class; the
+ * only difference is that its constructors do not throw REException.
+ * Instead, if a syntax error is encountered during construction, a
+ * RuntimeException will be thrown.
+ * <P>
+ * Note that this makes UncheckedRE dangerous if constructed with
+ * dynamic data.  Do not use UncheckedRE unless you are completely sure
+ * that all input being passed to it contains valid, well-formed 
+ * regular expressions for the syntax specified.
+ *
+ * @author <A HREF="mailto:wes@cacas.org">Wes Biggs</A>
+ * @see gnu.regexp.RE 
+ * @since gnu.regexp 1.1.4
+ */
+
+public final class UncheckedRE extends RE {
+  /**
+   * Constructs a regular expression pattern buffer without any compilation
+   * flags set, and using the default syntax (RESyntax.RE_SYNTAX_PERL5).
+   *
+   * @param pattern A regular expression pattern, in the form of a String,
+   *   StringBuffer or char[].  Other input types will be converted to
+   *   strings using the toString() method.
+   * @exception RuntimeException The input pattern could not be parsed.
+   * @exception NullPointerException The pattern was null.
+   */
+  public UncheckedRE(Object pattern) {
+      this(pattern,0,RESyntax.RE_SYNTAX_PERL5);
+  }
+
+  /**
+   * Constructs a regular expression pattern buffer using the specified
+   * compilation flags and the default syntax (RESyntax.RE_SYNTAX_PERL5).
+   *
+   * @param pattern A regular expression pattern, in the form of a String,
+   *   StringBuffer, or char[].  Other input types will be converted to
+   *   strings using the toString() method.
+   * @param cflags The logical OR of any combination of the compilation flags in the RE class.
+   * @exception RuntimeException The input pattern could not be parsed.
+   * @exception NullPointerException The pattern was null.
+   */
+  public UncheckedRE(Object pattern, int cflags) {
+      this(pattern,cflags,RESyntax.RE_SYNTAX_PERL5);
+  }
+
+  /**
+   * Constructs a regular expression pattern buffer using the specified
+   * compilation flags and regular expression syntax.
+   *
+   * @param pattern A regular expression pattern, in the form of a String,
+   *   StringBuffer, or char[].  Other input types will be converted to
+   *   strings using the toString() method.
+   * @param cflags The logical OR of any combination of the compilation flags in the RE class.
+   * @param syntax The type of regular expression syntax to use.
+   * @exception RuntimeException The input pattern could not be parsed.
+   * @exception NullPointerException The pattern was null.
+   */
+  public UncheckedRE(Object pattern, int cflags, RESyntax syntax) {
+      try {
+	  initialize(pattern,cflags,syntax,0,0);
+      } catch (REException e) { 
+	  throw new RuntimeException(e.getMessage());
+      }
+  }
+}
+
+