text: //===----------------------------------------------------------------------===//
  //
  //                     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_search(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);
  
  // http://llvm.org/bugs/show_bug.cgi?id=11118
  
  #include <regex>
  #include <cassert>
  #include "test_macros.h"
  
  int main()
  {
      assert(!std::regex_search("ab", std::regex("(?=^)b")));
      assert(!std::regex_search("ab", std::regex("a(?=^)b")));
  }
  