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//===----------------------------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// <regex>
// template <class BidirectionalIterator, class Allocator, class charT, class traits>
// bool
// regex_match(BidirectionalIterator first, BidirectionalIterator last,
// match_results<BidirectionalIterator, Allocator>& m,
// const basic_regex<charT, traits>& e,
// regex_constants::match_flag_type flags = regex_constants::match_default);
// std::regex in ECMAScript mode should not ignore capture groups inside lookahead assertions.
// For example, matching /(?=(a))(a)/ to "a" should yield two captures: \1 = "a", \2 = "a"
#include <regex>
#include <cassert>
#include "test_iterators.h"
int main()
{
{
std::regex re{"^(?=(.))a$"};
assert(re.mark_count() == 1);
std::string s{"a"};
std::smatch m;
assert(std::regex_match(s, m, re));
assert(m.size() == 2);
assert(m[0] == "a");
assert(m[1] == "a");
}
{
std::regex re{"^(a)(?=(.))(b)$"};
assert(re.mark_count() == 3);
std::string s{"ab"};
std::smatch m;
assert(std::regex_match(s, m, re));
assert(m.size() == 4);
assert(m[0] == "ab");
assert(m[1] == "a");
assert(m[2] == "b");
assert(m[3] == "b");
}
{
std::regex re{"^(.)(?=(.)(?=.(.)))(...)$"};
assert(re.mark_count() == 4);
std::string s{"abcd"};
std::smatch m;
assert(std::regex_match(s, m, re));
assert(m.size() == 5);
assert(m[0] == "abcd");
assert(m[1] == "a");
assert(m[2] == "b");
assert(m[3] == "d");
assert(m[4] == "bcd");
}
{
std::regex re{"^(a)(?!([^b]))(.c)$"};
assert(re.mark_count() == 3);
std::string s{"abc"};
std::smatch m;
assert(std::regex_match(s, m, re));
assert(m.size() == 4);
assert(m[0] == "abc");
assert(m[1] == "a");
assert(m[2] == "");
assert(m[3] == "bc");
}
{
std::regex re{"^(?!((b)))(?=(.))(?!(abc)).b$"};
assert(re.mark_count() == 4);
std::string s{"ab"};
std::smatch m;
assert(std::regex_match(s, m, re));
assert(m.size() == 5);
assert(m[0] == "ab");
assert(m[1] == "");
assert(m[2] == "");
assert(m[3] == "a");
assert(m[4] == "");
}
}
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