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_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);
  
  #include <regex>
  #include <cassert>
  
  #include "test_iterators.h"
  
  int main()
  {
  /*    {
          std::cmatch m;
          const char s[] = "a";
          assert(std::regex_match(s, m, std::regex("a", std::regex_constants::awk)));
          assert(m.size() == 1);
          assert(!m.empty());
          assert(!m.prefix().matched);
          assert(m.prefix().first == s);
          assert(m.prefix().second == m[0].first);
          assert(!m.suffix().matched);
          assert(m.suffix().first == m[0].second);
          assert(m.suffix().second == s+1);
          assert(m.length(0) == 1);
          assert(m.position(0) == 0);
          assert(m.str(0) == "a");
      }
      {
          std::cmatch m;
          const char s[] = "ab";
          assert(std::regex_match(s, m, std::regex("ab", std::regex_constants::awk)));
          assert(m.size() == 1);
          assert(!m.prefix().matched);
          assert(m.prefix().first == s);
          assert(m.prefix().second == m[0].first);
          assert(!m.suffix().matched);
          assert(m.suffix().first == m[0].second);
          assert(m.suffix().second == s+2);
          assert(m.length(0) == 2);
          assert(m.position(0) == 0);
          assert(m.str(0) == "ab");
      }
      {
          std::cmatch m;
          const char s[] = "ab";
          assert(!std::regex_match(s, m, std::regex("ba", std::regex_constants::awk)));
          assert(m.size() == 0);
          assert(m.empty());
      }
      {
          std::cmatch m;
          const char s[] = "aab";
          assert(!std::regex_match(s, m, std::regex("ab", std::regex_constants::awk)));
          assert(m.size() == 0);
      }
      {
          std::cmatch m;
          const char s[] = "aab";
          assert(!std::regex_match(s, m, std::regex("ab", std::regex_constants::awk),
                                              std::regex_constants::match_continuous));
          assert(m.size() == 0);
      }
      {
          std::cmatch m;
          const char s[] = "abcd";
          assert(!std::regex_match(s, m, std::regex("bc", std::regex_constants::awk)));
          assert(m.size() == 0);
      }
      {
          std::cmatch m;
          const char s[] = "abbc";
          assert(std::regex_match(s, m, std::regex("ab*c", std::regex_constants::awk)));
          assert(m.size() == 1);
          assert(!m.prefix().matched);
          assert(m.prefix().first == s);
          assert(m.prefix().second == m[0].first);
          assert(!m.suffix().matched);
          assert(m.suffix().first == m[0].second);
          assert(m.suffix().second == s+4);
          assert(m.length(0) == 4);
          assert(m.position(0) == 0);
          assert(m.str(0) == s);
      }
      {
          std::cmatch m;
          const char s[] = "ababc";
          assert(std::regex_match(s, m, std::regex("(ab)*c", std::regex_constants::awk)));
          assert(m.size() == 2);
          assert(!m.prefix().matched);
          assert(m.prefix().first == s);
          assert(m.prefix().second == m[0].first);
          assert(!m.suffix().matched);
          assert(m.suffix().first == m[0].second);
          assert(m.suffix().second == s+5);
          assert(m.length(0) == 5);
          assert(m.position(0) == 0);
          assert(m.str(0) == s);
          assert(m.length(1) == 2);
          assert(m.position(1) == 2);
          assert(m.str(1) == "ab");
      }
      {
          std::cmatch m;
          const char s[] = "abcdefghijk";
          assert(!std::regex_match(s, m, std::regex("cd((e)fg)hi",
                                   std::regex_constants::awk)));
          assert(m.size() == 0);
      }
      {
          std::cmatch m;
          const char s[] = "abc";
          assert(std::regex_match(s, m, std::regex("^abc", std::regex_constants::awk)));
          assert(m.size() == 1);
          assert(!m.prefix().matched);
          assert(m.prefix().first == s);
          assert(m.prefix().second == m[0].first);
          assert(!m.suffix().matched);
          assert(m.suffix().first == m[0].second);
          assert(m.suffix().second == s+3);
          assert(m.length(0) == 3);
          assert(m.position(0) == 0);
          assert(m.str(0) == s);
      }
      {
          std::cmatch m;
          const char s[] = "abcd";
          assert(!std::regex_match(s, m, std::regex("^abc", std::regex_constants::awk)));
          assert(m.size() == 0);
      }
      {
          std::cmatch m;
          const char s[] = "aabc";
          assert(!std::regex_match(s, m, std::regex("^abc", std::regex_constants::awk)));
          assert(m.size() == 0);
      }
      {
          std::cmatch m;
          const char s[] = "abc";
          assert(std::regex_match(s, m, std::regex("abc$", std::regex_constants::awk)));
          assert(m.size() == 1);
          assert(!m.prefix().matched);
          assert(m.prefix().first == s);
          assert(m.prefix().second == m[0].first);
          assert(!m.suffix().matched);
          assert(m.suffix().first == m[0].second);
          assert(m.suffix().second == s+3);
          assert(m.length(0) == 3);
          assert(m.position(0) == 0);
          assert(m.str(0) == s);
      }
      {
          std::cmatch m;
          const char s[] = "efabc";
          assert(!std::regex_match(s, m, std::regex("abc$", std::regex_constants::awk)));
          assert(m.size() == 0);
      }
      {
          std::cmatch m;
          const char s[] = "efabcg";
          assert(!std::regex_match(s, m, std::regex("abc$", std::regex_constants::awk)));
          assert(m.size() == 0);
      }
      {
          std::cmatch m;
          const char s[] = "abc";
          assert(std::regex_match(s, m, std::regex("a.c", std::regex_constants::awk)));
          assert(m.size() == 1);
          assert(!m.prefix().matched);
          assert(m.prefix().first == s);
          assert(m.prefix().second == m[0].first);
          assert(!m.suffix().matched);
          assert(m.suffix().first == m[0].second);
          assert(m.suffix().second == s+3);
          assert(m.length(0) == 3);
          assert(m.position(0) == 0);
          assert(m.str(0) == s);
      }
      {
          std::cmatch m;
          const char s[] = "acc";
          assert(std::regex_match(s, m, std::regex("a.c", std::regex_constants::awk)));
          assert(m.size() == 1);
          assert(!m.prefix().matched);
          assert(m.prefix().first == s);
          assert(m.prefix().second == m[0].first);
          assert(!m.suffix().matched);
          assert(m.suffix().first == m[0].second);
          assert(m.suffix().second == s+3);
          assert(m.length(0) == 3);
          assert(m.position(0) == 0);
          assert(m.str(0) == s);
      }
      {
          std::cmatch m;
          const char s[] = "acc";
          assert(std::regex_match(s, m, std::regex("a.c", std::regex_constants::awk)));
          assert(m.size() == 1);
          assert(!m.prefix().matched);
          assert(m.prefix().first == s);
          assert(m.prefix().second == m[0].first);
          assert(!m.suffix().matched);
          assert(m.suffix().first == m[0].second);
          assert(m.suffix().second == s+3);
          assert(m.length(0) == 3);
          assert(m.position(0) == 0);
          assert(m.str(0) == s);
      }
      {
          std::cmatch m;
          const char s[] = "abcdef";
          assert(std::regex_match(s, m, std::regex("(.*).*", std::regex_constants::awk)));
          assert(m.size() == 2);
          assert(!m.prefix().matched);
          assert(m.prefix().first == s);
          assert(m.prefix().second == m[0].first);
          assert(!m.suffix().matched);
          assert(m.suffix().first == m[0].second);
          assert(m.suffix().second == s+6);
          assert(m.length(0) == 6);
          assert(m.position(0) == 0);
          assert(m.str(0) == s);
          assert(m.length(1) == 6);
          assert(m.position(1) == 0);
          assert(m.str(1) == s);
      }
      {
          std::cmatch m;
          const char s[] = "bc";
          assert(!std::regex_match(s, m, std::regex("(a*)*", std::regex_constants::awk)));
          assert(m.size() == 0);
      }
      {
          std::cmatch m;
          const char s[] = "abbc";
          assert(!std::regex_match(s, m, std::regex("ab{3,5}c", std::regex_constants::awk)));
          assert(m.size() == 0);
      }
      {
          std::cmatch m;
          const char s[] = "abbbc";
          assert(std::regex_match(s, m, std::regex("ab{3,5}c", std::regex_constants::awk)));
          assert(m.size() == 1);
          assert(!m.prefix().matched);
          assert(m.prefix().first == s);
          assert(m.prefix().second == m[0].first);
          assert(!m.suffix().matched);
          assert(m.suffix().first == m[0].second);
          assert(m.suffix().second == m[0].second);
          assert(m.length(0) == std::char_traits<char>::length(s));
          assert(m.position(0) == 0);
          assert(m.str(0) == s);
      }
      {
          std::cmatch m;
          const char s[] = "abbbbc";
          assert(std::regex_match(s, m, std::regex("ab{3,5}c", std::regex_constants::awk)));
          assert(m.size() == 1);
          assert(!m.prefix().matched);
          assert(m.prefix().first == s);
          assert(m.prefix().second == m[0].first);
          assert(!m.suffix().matched);
          assert(m.suffix().first == m[0].second);
          assert(m.suffix().second == m[0].second);
          assert(m.length(0) == std::char_traits<char>::length(s));
          assert(m.position(0) == 0);
          assert(m.str(0) == s);
      }
      {
          std::cmatch m;
          const char s[] = "abbbbbc";
          assert(std::regex_match(s, m, std::regex("ab{3,5}c", std::regex_constants::awk)));
          assert(m.size() == 1);
          assert(!m.prefix().matched);
          assert(m.prefix().first == s);
          assert(m.prefix().second == m[0].first);
          assert(!m.suffix().matched);
          assert(m.suffix().first == m[0].second);
          assert(m.suffix().second == m[0].second);
          assert(m.length(0) == std::char_traits<char>::length(s));
          assert(m.position(0) == 0);
          assert(m.str(0) == s);
      }
      {
          std::cmatch m;
          const char s[] = "adefc";
          assert(!std::regex_match(s, m, std::regex("ab{3,5}c", std::regex_constants::awk)));
          assert(m.size() == 0);
      }
      {
          std::cmatch m;
          const char s[] = "abbbbbbc";
          assert(!std::regex_match(s, m, std::regex("ab{3,5}c", std::regex_constants::awk)));
          assert(m.size() == 0);
      }
      {
          std::cmatch m;
          const char s[] = "adec";
          assert(!std::regex_match(s, m, std::regex("a.{3,5}c", std::regex_constants::awk)));
          assert(m.size() == 0);
      }
      {
          std::cmatch m;
          const char s[] = "adefc";
          assert(std::regex_match(s, m, std::regex("a.{3,5}c", std::regex_constants::awk)));
          assert(m.size() == 1);
          assert(!m.prefix().matched);
          assert(m.prefix().first == s);
          assert(m.prefix().second == m[0].first);
          assert(!m.suffix().matched);
          assert(m.suffix().first == m[0].second);
          assert(m.suffix().second == m[0].second);
          assert(m.length(0) == std::char_traits<char>::length(s));
          assert(m.position(0) == 0);
          assert(m.str(0) == s);
      }
      {
          std::cmatch m;
          const char s[] = "adefgc";
          assert(std::regex_match(s, m, std::regex("a.{3,5}c", std::regex_constants::awk)));
          assert(m.size() == 1);
          assert(!m.prefix().matched);
          assert(m.prefix().first == s);
          assert(m.prefix().second == m[0].first);
          assert(!m.suffix().matched);
          assert(m.suffix().first == m[0].second);
          assert(m.suffix().second == m[0].second);
          assert(m.length(0) == std::char_traits<char>::length(s));
          assert(m.position(0) == 0);
          assert(m.str(0) == s);
      }
      {
          std::cmatch m;
          const char s[] = "adefghc";
          assert(std::regex_match(s, m, std::regex("a.{3,5}c", std::regex_constants::awk)));
          assert(m.size() == 1);
          assert(!m.prefix().matched);
          assert(m.prefix().first == s);
          assert(m.prefix().second == m[0].first);
          assert(!m.suffix().matched);
          assert(m.suffix().first == m[0].second);
          assert(m.suffix().second == m[0].second);
          assert(m.length(0) == std::char_traits<char>::length(s));
          assert(m.position(0) == 0);
          assert(m.str(0) == s);
      }
      {
          std::cmatch m;
          const char s[] = "adefghic";
          assert(!std::regex_match(s, m, std::regex("a.{3,5}c", std::regex_constants::awk)));
          assert(m.size() == 0);
      }
      {
          std::cmatch m;
          const char s[] = "tournament";
          assert(std::regex_match(s, m, std::regex("tour|to|tournament",
                                                std::regex_constants::awk)));
          assert(m.size() == 1);
          assert(!m.prefix().matched);
          assert(m.prefix().first == s);
          assert(m.prefix().second == m[0].first);
          assert(!m.suffix().matched);
          assert(m.suffix().first == m[0].second);
          assert(m.suffix().second == m[0].second);
          assert(m.length(0) == std::char_traits<char>::length(s));
          assert(m.position(0) == 0);
          assert(m.str(0) == s);
      }
      {
          std::cmatch m;
          const char s[] = "tournamenttotour";
          assert(std::regex_match(s, m, std::regex("(tour|to|tournament)+",
                 std::regex_constants::awk | std::regex_constants::nosubs)));
          assert(m.size() == 1);
          assert(!m.prefix().matched);
          assert(m.prefix().first == s);
          assert(m.prefix().second == m[0].first);
          assert(!m.suffix().matched);
          assert(m.suffix().first == m[0].second);
          assert(m.suffix().second == m[0].second);
          assert(m.length(0) == std::char_traits<char>::length(s));
          assert(m.position(0) == 0);
          assert(m.str(0) == s);
      }
      {
          std::cmatch m;
          const char s[] = "ttotour";
          assert(std::regex_match(s, m, std::regex("(tour|to|t)+",
                                                std::regex_constants::awk)));
          assert(m.size() == 2);
          assert(!m.prefix().matched);
          assert(m.prefix().first == s);
          assert(m.prefix().second == m[0].first);
          assert(!m.suffix().matched);
          assert(m.suffix().first == m[0].second);
          assert(m.suffix().second == m[0].second);
          assert(m.length(0) == std::char_traits<char>::length(s));
          assert(m.position(0) == 0);
          assert(m.str(0) == s);
          assert(m.length(1) == 4);
          assert(m.position(1) == 3);
          assert(m.str(1) == "tour");
      }
      {
          std::cmatch m;
          const char s[] = "-ab,ab-";
          assert(!std::regex_match(s, m, std::regex("-(.*),\1-", std::regex_constants::awk)));
          assert(m.size() == 0);
      }
      {
          std::cmatch m;
          const char s[] = "-ab,ab-";
          assert(std::regex_match(s, m, std::regex("-.*,.*-", std::regex_constants::awk)));
          assert(m.size() == 1);
          assert(!m.prefix().matched);
          assert(m.prefix().first == s);
          assert(m.prefix().second == m[0].first);
          assert(!m.suffix().matched);
          assert(m.suffix().first == m[0].second);
          assert(m.suffix().second == m[0].second);
          assert(m.length(0) == std::char_traits<char>::length(s));
          assert(m.position(0) == 0);
          assert(m.str(0) == s);
      }
      {
          std::cmatch m;
          const char s[] = "a";
          assert(std::regex_match(s, m, std::regex("^[a]$",
                                                   std::regex_constants::awk)));
          assert(m.size() == 1);
          assert(!m.prefix().matched);
          assert(m.prefix().first == s);
          assert(m.prefix().second == m[0].first);
          assert(!m.suffix().matched);
          assert(m.suffix().first == m[0].second);
          assert(m.suffix().second == m[0].second);
          assert(m.length(0) == 1);
          assert(m.position(0) == 0);
          assert(m.str(0) == "a");
      }
      {
          std::cmatch m;
          const char s[] = "a";
          assert(std::regex_match(s, m, std::regex("^[ab]$",
                                                   std::regex_constants::awk)));
          assert(m.size() == 1);
          assert(!m.prefix().matched);
          assert(m.prefix().first == s);
          assert(m.prefix().second == m[0].first);
          assert(!m.suffix().matched);
          assert(m.suffix().first == m[0].second);
          assert(m.suffix().second == m[0].second);
          assert(m.length(0) == 1);
          assert(m.position(0) == 0);
          assert(m.str(0) == "a");
      }
      {
          std::cmatch m;
          const char s[] = "c";
          assert(std::regex_match(s, m, std::regex("^[a-f]$",
                                                   std::regex_constants::awk)));
          assert(m.size() == 1);
          assert(!m.prefix().matched);
          assert(m.prefix().first == s);
          assert(m.prefix().second == m[0].first);
          assert(!m.suffix().matched);
          assert(m.suffix().first == m[0].second);
          assert(m.suffix().second == m[0].second);
          assert(m.length(0) == 1);
          assert(m.position(0) == 0);
          assert(m.str(0) == s);
      }
      {
          std::cmatch m;
          const char s[] = "g";
          assert(!std::regex_match(s, m, std::regex("^[a-f]$",
                                                   std::regex_constants::awk)));
          assert(m.size() == 0);
      }
      {
          std::cmatch m;
          const char s[] = "Iraqi";
          assert(!std::regex_match(s, m, std::regex("q[^u]",
                                                   std::regex_constants::awk)));
          assert(m.size() == 0);
      }
      {
          std::cmatch m;
          const char s[] = "Iraq";
          assert(!std::regex_match(s, m, std::regex("q[^u]",
                                                   std::regex_constants::awk)));
          assert(m.size() == 0);
      }
      {
          std::cmatch m;
          const char s[] = "AmB";
          assert(std::regex_match(s, m, std::regex("A[[:lower:]]B",
                                                   std::regex_constants::awk)));
          assert(m.size() == 1);
          assert(!m.prefix().matched);
          assert(m.prefix().first == s);
          assert(m.prefix().second == m[0].first);
          assert(!m.suffix().matched);
          assert(m.suffix().first == m[0].second);
          assert(m.suffix().second == m[0].second);
          assert(m.length(0) == std::char_traits<char>::length(s));
          assert(m.position(0) == 0);
          assert(m.str(0) == s);
      }
      {
          std::cmatch m;
          const char s[] = "AMB";
          assert(!std::regex_match(s, m, std::regex("A[[:lower:]]B",
                                                   std::regex_constants::awk)));
          assert(m.size() == 0);
      }
      {
          std::cmatch m;
          const char s[] = "AMB";
          assert(std::regex_match(s, m, std::regex("A[^[:lower:]]B",
                                                   std::regex_constants::awk)));
          assert(m.size() == 1);
          assert(!m.prefix().matched);
          assert(m.prefix().first == s);
          assert(m.prefix().second == m[0].first);
          assert(!m.suffix().matched);
          assert(m.suffix().first == m[0].second);
          assert(m.suffix().second == m[0].second);
          assert(m.length(0) == std::char_traits<char>::length(s));
          assert(m.position(0) == 0);
          assert(m.str(0) == s);
      }
      {
          std::cmatch m;
          const char s[] = "AmB";
          assert(!std::regex_match(s, m, std::regex("A[^[:lower:]]B",
                                                   std::regex_constants::awk)));
          assert(m.size() == 0);
      }
      {
          std::cmatch m;
          const char s[] = "A5B";
          assert(!std::regex_match(s, m, std::regex("A[^[:lower:]0-9]B",
                                                   std::regex_constants::awk)));
          assert(m.size() == 0);
      }
      {
          std::cmatch m;
          const char s[] = "A?B";
          assert(std::regex_match(s, m, std::regex("A[^[:lower:]0-9]B",
                                                   std::regex_constants::awk)));
          assert(m.size() == 1);
          assert(!m.prefix().matched);
          assert(m.prefix().first == s);
          assert(m.prefix().second == m[0].first);
          assert(!m.suffix().matched);
          assert(m.suffix().first == m[0].second);
          assert(m.suffix().second == m[0].second);
          assert(m.length(0) == std::char_traits<char>::length(s));
          assert(m.position(0) == 0);
          assert(m.str(0) == s);
      }
      {
          std::cmatch m;
          const char s[] = "-";
          assert(std::regex_match(s, m, std::regex("[a[.hyphen.]z]",
                                                   std::regex_constants::awk)));
          assert(m.size() == 1);
          assert(!m.prefix().matched);
          assert(m.prefix().first == s);
          assert(m.prefix().second == m[0].first);
          assert(!m.suffix().matched);
          assert(m.suffix().first == m[0].second);
          assert(m.suffix().second == m[0].second);
          assert(m.length(0) == std::char_traits<char>::length(s));
          assert(m.position(0) == 0);
          assert(m.str(0) == s);
      }
      {
          std::cmatch m;
          const char s[] = "z";
          assert(std::regex_match(s, m, std::regex("[a[.hyphen.]z]",
                                                   std::regex_constants::awk)));
          assert(m.size() == 1);
          assert(!m.prefix().matched);
          assert(m.prefix().first == s);
          assert(m.prefix().second == m[0].first);
          assert(!m.suffix().matched);
          assert(m.suffix().first == m[0].second);
          assert(m.suffix().second == m[0].second);
          assert(m.length(0) == std::char_traits<char>::length(s));
          assert(m.position(0) == 0);
          assert(m.str(0) == s);
      }
      {
          std::cmatch m;
          const char s[] = "m";
          assert(!std::regex_match(s, m, std::regex("[a[.hyphen.]z]",
                                                   std::regex_constants::awk)));
          assert(m.size() == 0);
      }
      std::locale::global(std::locale("cs_CZ.ISO8859-2"));
  */    {
          std::cmatch m;
          const char s[] = "m";
         /* assert(std::regex_match(s, m,*/ std::regex("[a[=M=]z]"/*,
                                                   std::regex_constants::awk*/);//));
  /*        assert(m.size() == 1);
          assert(!m.prefix().matched);
          assert(m.prefix().first == s);
          assert(m.prefix().second == m[0].first);
          assert(!m.suffix().matched);
          assert(m.suffix().first == m[0].second);
          assert(m.suffix().second == m[0].second);
          assert(m.length(0) == std::char_traits<char>::length(s));
          assert(m.position(0) == 0);
          assert(m.str(0) == s);
  */    }
  /*    {
          std::cmatch m;
          const char s[] = "Ch";
          assert(std::regex_match(s, m, std::regex("[a[.ch.]z]",
                     std::regex_constants::awk | std::regex_constants::icase)));
          assert(m.size() == 1);
          assert(!m.prefix().matched);
          assert(m.prefix().first == s);
          assert(m.prefix().second == m[0].first);
          assert(!m.suffix().matched);
          assert(m.suffix().first == m[0].second);
          assert(m.suffix().second == m[0].second);
          assert(m.length(0) == std::char_traits<char>::length(s));
          assert(m.position(0) == 0);
          assert(m.str(0) == s);
      }
      std::locale::global(std::locale("C"));
      {
          std::cmatch m;
          const char s[] = "m";
          assert(!std::regex_match(s, m, std::regex("[a[=M=]z]",
                                                   std::regex_constants::awk)));
          assert(m.size() == 0);
      }
      {
          std::cmatch m;
          const char s[] = "01a45cef9";
          assert(!std::regex_match(s, m, std::regex("[ace1-9]*",
                                                   std::regex_constants::awk)));
          assert(m.size() == 0);
      }
      {
          std::cmatch m;
          const char s[] = "01a45cef9";
          assert(!std::regex_match(s, m, std::regex("[ace1-9]+",
                                                   std::regex_constants::awk)));
          assert(m.size() == 0);
      }
      {
          const char r[] = "^[-+]?[0-9]+[CF]$";
          std::ptrdiff_t sr = std::char_traits<char>::length(r);
          typedef forward_iterator<const char*> FI;
          typedef bidirectional_iterator<const char*> BI;
          std::regex regex(FI(r), FI(r+sr), std::regex_constants::awk);
          std::match_results<BI> m;
          const char s[] = "-40C";
          std::ptrdiff_t ss = std::char_traits<char>::length(s);
          assert(std::regex_match(BI(s), BI(s+ss), m, regex));
          assert(m.size() == 1);
          assert(!m.prefix().matched);
          assert(m.prefix().first == BI(s));
          assert(m.prefix().second == m[0].first);
          assert(!m.suffix().matched);
          assert(m.suffix().first == m[0].second);
          assert(m.suffix().second == m[0].second);
          assert(m.length(0) == 4);
          assert(m.position(0) == 0);
          assert(m.str(0) == s);
      }
      {
          std::cmatch m;
          const char s[] = "\n\n\n";
          assert(std::regex_match(s, m, std::regex("[\\n]+",
                                                   std::regex_constants::awk)));
          assert(m.size() == 1);
          assert(!m.prefix().matched);
          assert(m.prefix().first == s);
          assert(m.prefix().second == m[0].first);
          assert(!m.suffix().matched);
          assert(m.suffix().first == m[0].second);
          assert(m.suffix().second == s + std::char_traits<char>::length(s));
          assert(m.length(0) == std::char_traits<char>::length(s));
          assert(m.position(0) == 0);
          assert(m.str(0) == s);
      }
      {
          std::wcmatch m;
          const wchar_t s[] = L"a";
          assert(std::regex_match(s, m, std::wregex(L"a", std::regex_constants::awk)));
          assert(m.size() == 1);
          assert(!m.empty());
          assert(!m.prefix().matched);
          assert(m.prefix().first == s);
          assert(m.prefix().second == m[0].first);
          assert(!m.suffix().matched);
          assert(m.suffix().first == m[0].second);
          assert(m.suffix().second == s+1);
          assert(m.length(0) == 1);
          assert(m.position(0) == 0);
          assert(m.str(0) == L"a");
      }
      {
          std::wcmatch m;
          const wchar_t s[] = L"ab";
          assert(std::regex_match(s, m, std::wregex(L"ab", std::regex_constants::awk)));
          assert(m.size() == 1);
          assert(!m.prefix().matched);
          assert(m.prefix().first == s);
          assert(m.prefix().second == m[0].first);
          assert(!m.suffix().matched);
          assert(m.suffix().first == m[0].second);
          assert(m.suffix().second == s+2);
          assert(m.length(0) == 2);
          assert(m.position(0) == 0);
          assert(m.str(0) == L"ab");
      }
      {
          std::wcmatch m;
          const wchar_t s[] = L"ab";
          assert(!std::regex_match(s, m, std::wregex(L"ba", std::regex_constants::awk)));
          assert(m.size() == 0);
          assert(m.empty());
      }
      {
          std::wcmatch m;
          const wchar_t s[] = L"aab";
          assert(!std::regex_match(s, m, std::wregex(L"ab", std::regex_constants::awk)));
          assert(m.size() == 0);
      }
      {
          std::wcmatch m;
          const wchar_t s[] = L"aab";
          assert(!std::regex_match(s, m, std::wregex(L"ab", std::regex_constants::awk),
                                              std::regex_constants::match_continuous));
          assert(m.size() == 0);
      }
      {
          std::wcmatch m;
          const wchar_t s[] = L"abcd";
          assert(!std::regex_match(s, m, std::wregex(L"bc", std::regex_constants::awk)));
          assert(m.size() == 0);
      }
      {
          std::wcmatch m;
          const wchar_t s[] = L"abbc";
          assert(std::regex_match(s, m, std::wregex(L"ab*c", std::regex_constants::awk)));
          assert(m.size() == 1);
          assert(!m.prefix().matched);
          assert(m.prefix().first == s);
          assert(m.prefix().second == m[0].first);
          assert(!m.suffix().matched);
          assert(m.suffix().first == m[0].second);
          assert(m.suffix().second == s+4);
          assert(m.length(0) == 4);
          assert(m.position(0) == 0);
          assert(m.str(0) == s);
      }
      {
          std::wcmatch m;
          const wchar_t s[] = L"ababc";
          assert(std::regex_match(s, m, std::wregex(L"(ab)*c", std::regex_constants::awk)));
          assert(m.size() == 2);
          assert(!m.prefix().matched);
          assert(m.prefix().first == s);
          assert(m.prefix().second == m[0].first);
          assert(!m.suffix().matched);
          assert(m.suffix().first == m[0].second);
          assert(m.suffix().second == s+5);
          assert(m.length(0) == 5);
          assert(m.position(0) == 0);
          assert(m.str(0) == s);
          assert(m.length(1) == 2);
          assert(m.position(1) == 2);
          assert(m.str(1) == L"ab");
      }
      {
          std::wcmatch m;
          const wchar_t s[] = L"abcdefghijk";
          assert(!std::regex_match(s, m, std::wregex(L"cd((e)fg)hi",
                                   std::regex_constants::awk)));
          assert(m.size() == 0);
      }
      {
          std::wcmatch m;
          const wchar_t s[] = L"abc";
          assert(std::regex_match(s, m, std::wregex(L"^abc", std::regex_constants::awk)));
          assert(m.size() == 1);
          assert(!m.prefix().matched);
          assert(m.prefix().first == s);
          assert(m.prefix().second == m[0].first);
          assert(!m.suffix().matched);
          assert(m.suffix().first == m[0].second);
          assert(m.suffix().second == s+3);
          assert(m.length(0) == 3);
          assert(m.position(0) == 0);
          assert(m.str(0) == s);
      }
      {
          std::wcmatch m;
          const wchar_t s[] = L"abcd";
          assert(!std::regex_match(s, m, std::wregex(L"^abc", std::regex_constants::awk)));
          assert(m.size() == 0);
      }
      {
          std::wcmatch m;
          const wchar_t s[] = L"aabc";
          assert(!std::regex_match(s, m, std::wregex(L"^abc", std::regex_constants::awk)));
          assert(m.size() == 0);
      }
      {
          std::wcmatch m;
          const wchar_t s[] = L"abc";
          assert(std::regex_match(s, m, std::wregex(L"abc$", std::regex_constants::awk)));
          assert(m.size() == 1);
          assert(!m.prefix().matched);
          assert(m.prefix().first == s);
          assert(m.prefix().second == m[0].first);
          assert(!m.suffix().matched);
          assert(m.suffix().first == m[0].second);
          assert(m.suffix().second == s+3);
          assert(m.length(0) == 3);
          assert(m.position(0) == 0);
          assert(m.str(0) == s);
      }
      {
          std::wcmatch m;
          const wchar_t s[] = L"efabc";
          assert(!std::regex_match(s, m, std::wregex(L"abc$", std::regex_constants::awk)));
          assert(m.size() == 0);
      }
      {
          std::wcmatch m;
          const wchar_t s[] = L"efabcg";
          assert(!std::regex_match(s, m, std::wregex(L"abc$", std::regex_constants::awk)));
          assert(m.size() == 0);
      }
      {
          std::wcmatch m;
          const wchar_t s[] = L"abc";
          assert(std::regex_match(s, m, std::wregex(L"a.c", std::regex_constants::awk)));
          assert(m.size() == 1);
          assert(!m.prefix().matched);
          assert(m.prefix().first == s);
          assert(m.prefix().second == m[0].first);
          assert(!m.suffix().matched);
          assert(m.suffix().first == m[0].second);
          assert(m.suffix().second == s+3);
          assert(m.length(0) == 3);
          assert(m.position(0) == 0);
          assert(m.str(0) == s);
      }
      {
          std::wcmatch m;
          const wchar_t s[] = L"acc";
          assert(std::regex_match(s, m, std::wregex(L"a.c", std::regex_constants::awk)));
          assert(m.size() == 1);
          assert(!m.prefix().matched);
          assert(m.prefix().first == s);
          assert(m.prefix().second == m[0].first);
          assert(!m.suffix().matched);
          assert(m.suffix().first == m[0].second);
          assert(m.suffix().second == s+3);
          assert(m.length(0) == 3);
          assert(m.position(0) == 0);
          assert(m.str(0) == s);
      }
      {
          std::wcmatch m;
          const wchar_t s[] = L"acc";
          assert(std::regex_match(s, m, std::wregex(L"a.c", std::regex_constants::awk)));
          assert(m.size() == 1);
          assert(!m.prefix().matched);
          assert(m.prefix().first == s);
          assert(m.prefix().second == m[0].first);
          assert(!m.suffix().matched);
          assert(m.suffix().first == m[0].second);
          assert(m.suffix().second == s+3);
          assert(m.length(0) == 3);
          assert(m.position(0) == 0);
          assert(m.str(0) == s);
      }
      {
          std::wcmatch m;
          const wchar_t s[] = L"abcdef";
          assert(std::regex_match(s, m, std::wregex(L"(.*).*", std::regex_constants::awk)));
          assert(m.size() == 2);
          assert(!m.prefix().matched);
          assert(m.prefix().first == s);
          assert(m.prefix().second == m[0].first);
          assert(!m.suffix().matched);
          assert(m.suffix().first == m[0].second);
          assert(m.suffix().second == s+6);
          assert(m.length(0) == 6);
          assert(m.position(0) == 0);
          assert(m.str(0) == s);
          assert(m.length(1) == 6);
          assert(m.position(1) == 0);
          assert(m.str(1) == s);
      }
      {
          std::wcmatch m;
          const wchar_t s[] = L"bc";
          assert(!std::regex_match(s, m, std::wregex(L"(a*)*", std::regex_constants::awk)));
          assert(m.size() == 0);
      }
      {
          std::wcmatch m;
          const wchar_t s[] = L"abbc";
          assert(!std::regex_match(s, m, std::wregex(L"ab{3,5}c", std::regex_constants::awk)));
          assert(m.size() == 0);
      }
      {
          std::wcmatch m;
          const wchar_t s[] = L"abbbc";
          assert(std::regex_match(s, m, std::wregex(L"ab{3,5}c", std::regex_constants::awk)));
          assert(m.size() == 1);
          assert(!m.prefix().matched);
          assert(m.prefix().first == s);
          assert(m.prefix().second == m[0].first);
          assert(!m.suffix().matched);
          assert(m.suffix().first == m[0].second);
          assert(m.suffix().second == m[0].second);
          assert(m.length(0) == std::char_traits<wchar_t>::length(s));
          assert(m.position(0) == 0);
          assert(m.str(0) == s);
      }
      {
          std::wcmatch m;
          const wchar_t s[] = L"abbbbc";
          assert(std::regex_match(s, m, std::wregex(L"ab{3,5}c", std::regex_constants::awk)));
          assert(m.size() == 1);
          assert(!m.prefix().matched);
          assert(m.prefix().first == s);
          assert(m.prefix().second == m[0].first);
          assert(!m.suffix().matched);
          assert(m.suffix().first == m[0].second);
          assert(m.suffix().second == m[0].second);
          assert(m.length(0) == std::char_traits<wchar_t>::length(s));
          assert(m.position(0) == 0);
          assert(m.str(0) == s);
      }
      {
          std::wcmatch m;
          const wchar_t s[] = L"abbbbbc";
          assert(std::regex_match(s, m, std::wregex(L"ab{3,5}c", std::regex_constants::awk)));
          assert(m.size() == 1);
          assert(!m.prefix().matched);
          assert(m.prefix().first == s);
          assert(m.prefix().second == m[0].first);
          assert(!m.suffix().matched);
          assert(m.suffix().first == m[0].second);
          assert(m.suffix().second == m[0].second);
          assert(m.length(0) == std::char_traits<wchar_t>::length(s));
          assert(m.position(0) == 0);
          assert(m.str(0) == s);
      }
      {
          std::wcmatch m;
          const wchar_t s[] = L"adefc";
          assert(!std::regex_match(s, m, std::wregex(L"ab{3,5}c", std::regex_constants::awk)));
          assert(m.size() == 0);
      }
      {
          std::wcmatch m;
          const wchar_t s[] = L"abbbbbbc";
          assert(!std::regex_match(s, m, std::wregex(L"ab{3,5}c", std::regex_constants::awk)));
          assert(m.size() == 0);
      }
      {
          std::wcmatch m;
          const wchar_t s[] = L"adec";
          assert(!std::regex_match(s, m, std::wregex(L"a.{3,5}c", std::regex_constants::awk)));
          assert(m.size() == 0);
      }
      {
          std::wcmatch m;
          const wchar_t s[] = L"adefc";
          assert(std::regex_match(s, m, std::wregex(L"a.{3,5}c", std::regex_constants::awk)));
          assert(m.size() == 1);
          assert(!m.prefix().matched);
          assert(m.prefix().first == s);
          assert(m.prefix().second == m[0].first);
          assert(!m.suffix().matched);
          assert(m.suffix().first == m[0].second);
          assert(m.suffix().second == m[0].second);
          assert(m.length(0) == std::char_traits<wchar_t>::length(s));
          assert(m.position(0) == 0);
          assert(m.str(0) == s);
      }
      {
          std::wcmatch m;
          const wchar_t s[] = L"adefgc";
          assert(std::regex_match(s, m, std::wregex(L"a.{3,5}c", std::regex_constants::awk)));
          assert(m.size() == 1);
          assert(!m.prefix().matched);
          assert(m.prefix().first == s);
          assert(m.prefix().second == m[0].first);
          assert(!m.suffix().matched);
          assert(m.suffix().first == m[0].second);
          assert(m.suffix().second == m[0].second);
          assert(m.length(0) == std::char_traits<wchar_t>::length(s));
          assert(m.position(0) == 0);
          assert(m.str(0) == s);
      }
      {
          std::wcmatch m;
          const wchar_t s[] = L"adefghc";
          assert(std::regex_match(s, m, std::wregex(L"a.{3,5}c", std::regex_constants::awk)));
          assert(m.size() == 1);
          assert(!m.prefix().matched);
          assert(m.prefix().first == s);
          assert(m.prefix().second == m[0].first);
          assert(!m.suffix().matched);
          assert(m.suffix().first == m[0].second);
          assert(m.suffix().second == m[0].second);
          assert(m.length(0) == std::char_traits<wchar_t>::length(s));
          assert(m.position(0) == 0);
          assert(m.str(0) == s);
      }
      {
          std::wcmatch m;
          const wchar_t s[] = L"adefghic";
          assert(!std::regex_match(s, m, std::wregex(L"a.{3,5}c", std::regex_constants::awk)));
          assert(m.size() == 0);
      }
      {
          std::wcmatch m;
          const wchar_t s[] = L"tournament";
          assert(std::regex_match(s, m, std::wregex(L"tour|to|tournament",
                                                std::regex_constants::awk)));
          assert(m.size() == 1);
          assert(!m.prefix().matched);
          assert(m.prefix().first == s);
          assert(m.prefix().second == m[0].first);
          assert(!m.suffix().matched);
          assert(m.suffix().first == m[0].second);
          assert(m.suffix().second == m[0].second);
          assert(m.length(0) == std::char_traits<wchar_t>::length(s));
          assert(m.position(0) == 0);
          assert(m.str(0) == s);
      }
      {
          std::wcmatch m;
          const wchar_t s[] = L"tournamenttotour";
          assert(std::regex_match(s, m, std::wregex(L"(tour|to|tournament)+",
                 std::regex_constants::awk | std::regex_constants::nosubs)));
          assert(m.size() == 1);
          assert(!m.prefix().matched);
          assert(m.prefix().first == s);
          assert(m.prefix().second == m[0].first);
          assert(!m.suffix().matched);
          assert(m.suffix().first == m[0].second);
          assert(m.suffix().second == m[0].second);
          assert(m.length(0) == std::char_traits<wchar_t>::length(s));
          assert(m.position(0) == 0);
          assert(m.str(0) == s);
      }
      {
          std::wcmatch m;
          const wchar_t s[] = L"ttotour";
          assert(std::regex_match(s, m, std::wregex(L"(tour|to|t)+",
                                                std::regex_constants::awk)));
          assert(m.size() == 2);
          assert(!m.prefix().matched);
          assert(m.prefix().first == s);
          assert(m.prefix().second == m[0].first);
          assert(!m.suffix().matched);
          assert(m.suffix().first == m[0].second);
          assert(m.suffix().second == m[0].second);
          assert(m.length(0) == std::char_traits<wchar_t>::length(s));
          assert(m.position(0) == 0);
          assert(m.str(0) == s);
          assert(m.length(1) == 4);
          assert(m.position(1) == 3);
          assert(m.str(1) == L"tour");
      }
      {
          std::wcmatch m;
          const wchar_t s[] = L"-ab,ab-";
          assert(!std::regex_match(s, m, std::wregex(L"-(.*),\1-", std::regex_constants::awk)));
          assert(m.size() == 0);
      }
      {
          std::wcmatch m;
          const wchar_t s[] = L"-ab,ab-";
          assert(std::regex_match(s, m, std::wregex(L"-.*,.*-", std::regex_constants::awk)));
          assert(m.size() == 1);
          assert(!m.prefix().matched);
          assert(m.prefix().first == s);
          assert(m.prefix().second == m[0].first);
          assert(!m.suffix().matched);
          assert(m.suffix().first == m[0].second);
          assert(m.suffix().second == m[0].second);
          assert(m.length(0) == std::char_traits<wchar_t>::length(s));
          assert(m.position(0) == 0);
          assert(m.str(0) == s);
      }
      {
          std::wcmatch m;
          const wchar_t s[] = L"a";
          assert(std::regex_match(s, m, std::wregex(L"^[a]$",
                                                   std::regex_constants::awk)));
          assert(m.size() == 1);
          assert(!m.prefix().matched);
          assert(m.prefix().first == s);
          assert(m.prefix().second == m[0].first);
          assert(!m.suffix().matched);
          assert(m.suffix().first == m[0].second);
          assert(m.suffix().second == m[0].second);
          assert(m.length(0) == 1);
          assert(m.position(0) == 0);
          assert(m.str(0) == L"a");
      }
      {
          std::wcmatch m;
          const wchar_t s[] = L"a";
          assert(std::regex_match(s, m, std::wregex(L"^[ab]$",
                                                   std::regex_constants::awk)));
          assert(m.size() == 1);
          assert(!m.prefix().matched);
          assert(m.prefix().first == s);
          assert(m.prefix().second == m[0].first);
          assert(!m.suffix().matched);
          assert(m.suffix().first == m[0].second);
          assert(m.suffix().second == m[0].second);
          assert(m.length(0) == 1);
          assert(m.position(0) == 0);
          assert(m.str(0) == L"a");
      }
      {
          std::wcmatch m;
          const wchar_t s[] = L"c";
          assert(std::regex_match(s, m, std::wregex(L"^[a-f]$",
                                                   std::regex_constants::awk)));
          assert(m.size() == 1);
          assert(!m.prefix().matched);
          assert(m.prefix().first == s);
          assert(m.prefix().second == m[0].first);
          assert(!m.suffix().matched);
          assert(m.suffix().first == m[0].second);
          assert(m.suffix().second == m[0].second);
          assert(m.length(0) == 1);
          assert(m.position(0) == 0);
          assert(m.str(0) == s);
      }
      {
          std::wcmatch m;
          const wchar_t s[] = L"g";
          assert(!std::regex_match(s, m, std::wregex(L"^[a-f]$",
                                                   std::regex_constants::awk)));
          assert(m.size() == 0);
      }
      {
          std::wcmatch m;
          const wchar_t s[] = L"Iraqi";
          assert(!std::regex_match(s, m, std::wregex(L"q[^u]",
                                                   std::regex_constants::awk)));
          assert(m.size() == 0);
      }
      {
          std::wcmatch m;
          const wchar_t s[] = L"Iraq";
          assert(!std::regex_match(s, m, std::wregex(L"q[^u]",
                                                   std::regex_constants::awk)));
          assert(m.size() == 0);
      }
      {
          std::wcmatch m;
          const wchar_t s[] = L"AmB";
          assert(std::regex_match(s, m, std::wregex(L"A[[:lower:]]B",
                                                   std::regex_constants::awk)));
          assert(m.size() == 1);
          assert(!m.prefix().matched);
          assert(m.prefix().first == s);
          assert(m.prefix().second == m[0].first);
          assert(!m.suffix().matched);
          assert(m.suffix().first == m[0].second);
          assert(m.suffix().second == m[0].second);
          assert(m.length(0) == std::char_traits<wchar_t>::length(s));
          assert(m.position(0) == 0);
          assert(m.str(0) == s);
      }
      {
          std::wcmatch m;
          const wchar_t s[] = L"AMB";
          assert(!std::regex_match(s, m, std::wregex(L"A[[:lower:]]B",
                                                   std::regex_constants::awk)));
          assert(m.size() == 0);
      }
      {
          std::wcmatch m;
          const wchar_t s[] = L"AMB";
          assert(std::regex_match(s, m, std::wregex(L"A[^[:lower:]]B",
                                                   std::regex_constants::awk)));
          assert(m.size() == 1);
          assert(!m.prefix().matched);
          assert(m.prefix().first == s);
          assert(m.prefix().second == m[0].first);
          assert(!m.suffix().matched);
          assert(m.suffix().first == m[0].second);
          assert(m.suffix().second == m[0].second);
          assert(m.length(0) == std::char_traits<wchar_t>::length(s));
          assert(m.position(0) == 0);
          assert(m.str(0) == s);
      }
      {
          std::wcmatch m;
          const wchar_t s[] = L"AmB";
          assert(!std::regex_match(s, m, std::wregex(L"A[^[:lower:]]B",
                                                   std::regex_constants::awk)));
          assert(m.size() == 0);
      }
      {
          std::wcmatch m;
          const wchar_t s[] = L"A5B";
          assert(!std::regex_match(s, m, std::wregex(L"A[^[:lower:]0-9]B",
                                                   std::regex_constants::awk)));
          assert(m.size() == 0);
      }
      {
          std::wcmatch m;
          const wchar_t s[] = L"A?B";
          assert(std::regex_match(s, m, std::wregex(L"A[^[:lower:]0-9]B",
                                                   std::regex_constants::awk)));
          assert(m.size() == 1);
          assert(!m.prefix().matched);
          assert(m.prefix().first == s);
          assert(m.prefix().second == m[0].first);
          assert(!m.suffix().matched);
          assert(m.suffix().first == m[0].second);
          assert(m.suffix().second == m[0].second);
          assert(m.length(0) == std::char_traits<wchar_t>::length(s));
          assert(m.position(0) == 0);
          assert(m.str(0) == s);
      }
      {
          std::wcmatch m;
          const wchar_t s[] = L"-";
          assert(std::regex_match(s, m, std::wregex(L"[a[.hyphen.]z]",
                                                   std::regex_constants::awk)));
          assert(m.size() == 1);
          assert(!m.prefix().matched);
          assert(m.prefix().first == s);
          assert(m.prefix().second == m[0].first);
          assert(!m.suffix().matched);
          assert(m.suffix().first == m[0].second);
          assert(m.suffix().second == m[0].second);
          assert(m.length(0) == std::char_traits<wchar_t>::length(s));
          assert(m.position(0) == 0);
          assert(m.str(0) == s);
      }
      {
          std::wcmatch m;
          const wchar_t s[] = L"z";
          assert(std::regex_match(s, m, std::wregex(L"[a[.hyphen.]z]",
                                                   std::regex_constants::awk)));
          assert(m.size() == 1);
          assert(!m.prefix().matched);
          assert(m.prefix().first == s);
          assert(m.prefix().second == m[0].first);
          assert(!m.suffix().matched);
          assert(m.suffix().first == m[0].second);
          assert(m.suffix().second == m[0].second);
          assert(m.length(0) == std::char_traits<wchar_t>::length(s));
          assert(m.position(0) == 0);
          assert(m.str(0) == s);
      }
      {
          std::wcmatch m;
          const wchar_t s[] = L"m";
          assert(!std::regex_match(s, m, std::wregex(L"[a[.hyphen.]z]",
                                                   std::regex_constants::awk)));
          assert(m.size() == 0);
      }
      std::locale::global(std::locale("cs_CZ.ISO8859-2"));
      {
          std::wcmatch m;
          const wchar_t s[] = L"m";
          assert(std::regex_match(s, m, std::wregex(L"[a[=M=]z]",
                                                   std::regex_constants::awk)));
          assert(m.size() == 1);
          assert(!m.prefix().matched);
          assert(m.prefix().first == s);
          assert(m.prefix().second == m[0].first);
          assert(!m.suffix().matched);
          assert(m.suffix().first == m[0].second);
          assert(m.suffix().second == m[0].second);
          assert(m.length(0) == std::char_traits<wchar_t>::length(s));
          assert(m.position(0) == 0);
          assert(m.str(0) == s);
      }
      {
          std::wcmatch m;
          const wchar_t s[] = L"Ch";
          assert(std::regex_match(s, m, std::wregex(L"[a[.ch.]z]",
                     std::regex_constants::awk | std::regex_constants::icase)));
          assert(m.size() == 1);
          assert(!m.prefix().matched);
          assert(m.prefix().first == s);
          assert(m.prefix().second == m[0].first);
          assert(!m.suffix().matched);
          assert(m.suffix().first == m[0].second);
          assert(m.suffix().second == m[0].second);
          assert(m.length(0) == std::char_traits<wchar_t>::length(s));
          assert(m.position(0) == 0);
          assert(m.str(0) == s);
      }
      std::locale::global(std::locale("C"));
      {
          std::wcmatch m;
          const wchar_t s[] = L"m";
          assert(!std::regex_match(s, m, std::wregex(L"[a[=M=]z]",
                                                   std::regex_constants::awk)));
          assert(m.size() == 0);
      }
      {
          std::wcmatch m;
          const wchar_t s[] = L"01a45cef9";
          assert(!std::regex_match(s, m, std::wregex(L"[ace1-9]*",
                                                   std::regex_constants::awk)));
          assert(m.size() == 0);
      }
      {
          std::wcmatch m;
          const wchar_t s[] = L"01a45cef9";
          assert(!std::regex_match(s, m, std::wregex(L"[ace1-9]+",
                                                   std::regex_constants::awk)));
          assert(m.size() == 0);
      }
      {
          const wchar_t r[] = L"^[-+]?[0-9]+[CF]$";
          std::ptrdiff_t sr = std::char_traits<wchar_t>::length(r);
          typedef forward_iterator<const wchar_t*> FI;
          typedef bidirectional_iterator<const wchar_t*> BI;
          std::wregex regex(FI(r), FI(r+sr), std::regex_constants::awk);
          std::match_results<BI> m;
          const wchar_t s[] = L"-40C";
          std::ptrdiff_t ss = std::char_traits<wchar_t>::length(s);
          assert(std::regex_match(BI(s), BI(s+ss), m, regex));
          assert(m.size() == 1);
          assert(!m.prefix().matched);
          assert(m.prefix().first == BI(s));
          assert(m.prefix().second == m[0].first);
          assert(!m.suffix().matched);
          assert(m.suffix().first == m[0].second);
          assert(m.suffix().second == m[0].second);
          assert(m.length(0) == 4);
          assert(m.position(0) == 0);
          assert(m.str(0) == s);
      }
      {
          std::wcmatch m;
          const wchar_t s[] = L"\n\n\n";
          assert(std::regex_match(s, m, std::wregex(L"[\\n]+",
                                                   std::regex_constants::awk)));
          assert(m.size() == 1);
          assert(!m.prefix().matched);
          assert(m.prefix().first == s);
          assert(m.prefix().second == m[0].first);
          assert(!m.suffix().matched);
          assert(m.suffix().first == m[0].second);
          assert(m.suffix().second == s + std::char_traits<wchar_t>::length(s));
          assert(m.length(0) == std::char_traits<wchar_t>::length(s));
          assert(m.position(0) == 0);
          assert(m.str(0) == s);
      }
  */}
  