Introduce Regex::isLiteralERE function.

This will be used to implement an optimisation for literal entries
in special case lists.

Differential Revision: http://llvm-reviews.chandlerc.com/D1278

llvm-svn: 187731

1 files changed, 4 insertions, 0 deletions

diff --git a/llvm/include/llvm/Support/Regex.h b/llvm/include/llvm/Support/Regex.h
index 82df2c67bd0..3d071bedbd8 100644
--- a/llvm/include/llvm/Support/Regex.h
+++ b/llvm/include/llvm/Support/Regex.h
@@ -77,6 +77,10 @@ namespace llvm {
     /// string.
     std::string sub(StringRef Repl, StringRef String, std::string *Error = 0);
 
+    /// \brief If this function returns true, ^Str$ is an extended regular
+    /// expression that matches Str and only Str.
+    static bool isLiteralERE(StringRef Str);
+
   private:
     struct llvm_regex *preg;
     int error;