text: //===----------------------------------------------------------------------===//
  //
  // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
  // See https://llvm.org/LICENSE.txt for license information.
  // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
  //
  //===----------------------------------------------------------------------===//
  
  // <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);
  
  #include <regex>
  #include <string>
  #include <list>
  #include <cassert>
  #include "test_macros.h"
  
  int main(int, char**)
  {
      // This regex_iterator uses regex_search(__wrap_iter<_Iter> __first, ...)
      // Test for https://bugs.llvm.org/show_bug.cgi?id=16240 fixed in r185273.
      {
          std::string s("aaaa a");
          std::regex re("\\ba");
          std::sregex_iterator it(s.begin(), s.end(), re);
          std::sregex_iterator end = std::sregex_iterator();
  
          assert(it->position(0) == 0);
          assert(it->length(0) == 1);
  
          ++it;
          assert(it->position(0) == 5);
          assert(it->length(0) == 1);
  
          ++it;
          assert(it == end);
      }
  
      // This regex_iterator uses regex_search(_BidirectionalIterator __first, ...)
      {
          std::string s("aaaa a");
          std::list<char> l(s.begin(), s.end());
          std::regex re("\\ba");
          std::regex_iterator<std::list<char>::iterator> it(l.begin(), l.end(), re);
          std::regex_iterator<std::list<char>::iterator> end = std::regex_iterator<std::list<char>::iterator>();
  
          assert(it->position(0) == 0);
          assert(it->length(0) == 1);
  
          ++it;
          assert(it->position(0) == 5);
          assert(it->length(0) == 1);
  
          ++it;
          assert(it == end);
      }
  
    return 0;
  }
  