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.
  //
  //===----------------------------------------------------------------------===//
  
  // REQUIRES: locale.cs_CZ.ISO8859-2
  
  // <regex>
  
  // template <class charT> struct regex_traits;
  
  // template <class ForwardIterator>
  //   string_type
  //   lookup_collatename(ForwardIterator first, ForwardIterator last) const;
  
  // TODO: investigation needed
  // XFAIL: linux-gnu
  
  #include <regex>
  #include <iterator>
  #include <cassert>
  #include "test_iterators.h"
  
  template <class char_type>
  void
  test(const char_type* A, const std::basic_string<char_type>& expected)
  {
      std::regex_traits<char_type> t;
      typedef forward_iterator<const char_type*> F;
      assert(t.lookup_collatename(F(A), F(A + t.length(A))) == expected);
  }
  
  int main()
  {
      test("NUL", std::string("\x00", 1));
      test("alert", std::string("\x07"));
      test("backspace", std::string("\x08"));
      test("tab", std::string("\x09"));
      test("carriage-return", std::string("\x0D"));
      test("newline", std::string("\x0A"));
      test("vertical-tab", std::string("\x0B"));
      test("form-feed", std::string("\x0C"));
      test("space", std::string(" "));
      test("exclamation-mark", std::string("!"));
      test("quotation-mark", std::string("\""));
      test("number-sign", std::string("#"));
      test("dollar-sign", std::string("$"));
      test("percent-sign", std::string("%"));
      test("ampersand", std::string("&"));
      test("apostrophe", std::string("\'"));
      test("left-parenthesis", std::string("("));
      test("right-parenthesis", std::string(")"));
      test("asterisk", std::string("*"));
      test("plus-sign", std::string("+"));
      test("comma", std::string(","));
      test("hyphen-minus", std::string("-"));
      test("hyphen", std::string("-"));
      test("full-stop", std::string("."));
      test("period", std::string("."));
      test("slash", std::string("/"));
      test("solidus", std::string("/"));
      test("zero", std::string("0"));
      test("one", std::string("1"));
      test("two", std::string("2"));
      test("three", std::string("3"));
      test("four", std::string("4"));
      test("five", std::string("5"));
      test("six", std::string("6"));
      test("seven", std::string("7"));
      test("eight", std::string("8"));
      test("nine", std::string("9"));
      test("colon", std::string(":"));
      test("semicolon", std::string(";"));
      test("less-than-sign", std::string("<"));
      test("equals-sign", std::string("="));
      test("greater-than-sign", std::string(">"));
      test("question-mark", std::string("?"));
      test("commercial-at", std::string("@"));
      for (char c = 'A'; c <= 'Z'; ++c)
      {
          const char a[2] = {c};
          test(a, std::string(a));
      }
      test("left-square-bracket", std::string("["));
      test("backslash", std::string("\\"));
      test("reverse-solidus", std::string("\\"));
      test("right-square-bracket", std::string("]"));
      test("circumflex-accent", std::string("^"));
      test("circumflex", std::string("^"));
      test("low-line", std::string("_"));
      test("underscore", std::string("_"));
      test("grave-accent", std::string("`"));
      for (char c = 'a'; c <= 'z'; ++c)
      {
          const char a[2] = {c};
          test(a, std::string(a));
      }
      test("left-brace", std::string("{"));
      test("left-curly-bracket", std::string("{"));
      test("vertical-line", std::string("|"));
      test("right-brace", std::string("}"));
      test("right-curly-bracket", std::string("}"));
      test("tilde", std::string("~"));
  
      test("tild", std::string(""));
      test("ch", std::string(""));
      std::locale::global(std::locale("cs_CZ.ISO8859-2"));
      test("ch", std::string("ch"));
      std::locale::global(std::locale("C"));
  
      test(L"NUL", std::wstring(L"\x00", 1));
      test(L"alert", std::wstring(L"\x07"));
      test(L"backspace", std::wstring(L"\x08"));
      test(L"tab", std::wstring(L"\x09"));
      test(L"carriage-return", std::wstring(L"\x0D"));
      test(L"newline", std::wstring(L"\x0A"));
      test(L"vertical-tab", std::wstring(L"\x0B"));
      test(L"form-feed", std::wstring(L"\x0C"));
      test(L"space", std::wstring(L" "));
      test(L"exclamation-mark", std::wstring(L"!"));
      test(L"quotation-mark", std::wstring(L"\""));
      test(L"number-sign", std::wstring(L"#"));
      test(L"dollar-sign", std::wstring(L"$"));
      test(L"percent-sign", std::wstring(L"%"));
      test(L"ampersand", std::wstring(L"&"));
      test(L"apostrophe", std::wstring(L"\'"));
      test(L"left-parenthesis", std::wstring(L"("));
      test(L"right-parenthesis", std::wstring(L")"));
      test(L"asterisk", std::wstring(L"*"));
      test(L"plus-sign", std::wstring(L"+"));
      test(L"comma", std::wstring(L","));
      test(L"hyphen-minus", std::wstring(L"-"));
      test(L"hyphen", std::wstring(L"-"));
      test(L"full-stop", std::wstring(L"."));
      test(L"period", std::wstring(L"."));
      test(L"slash", std::wstring(L"/"));
      test(L"solidus", std::wstring(L"/"));
      test(L"zero", std::wstring(L"0"));
      test(L"one", std::wstring(L"1"));
      test(L"two", std::wstring(L"2"));
      test(L"three", std::wstring(L"3"));
      test(L"four", std::wstring(L"4"));
      test(L"five", std::wstring(L"5"));
      test(L"six", std::wstring(L"6"));
      test(L"seven", std::wstring(L"7"));
      test(L"eight", std::wstring(L"8"));
      test(L"nine", std::wstring(L"9"));
      test(L"colon", std::wstring(L":"));
      test(L"semicolon", std::wstring(L";"));
      test(L"less-than-sign", std::wstring(L"<"));
      test(L"equals-sign", std::wstring(L"="));
      test(L"greater-than-sign", std::wstring(L">"));
      test(L"question-mark", std::wstring(L"?"));
      test(L"commercial-at", std::wstring(L"@"));
      for (wchar_t c = L'A'; c <= L'Z'; ++c)
      {
          const wchar_t a[2] = {c};
          test(a, std::wstring(a));
      }
      test(L"left-square-bracket", std::wstring(L"["));
      test(L"backslash", std::wstring(L"\\"));
      test(L"reverse-solidus", std::wstring(L"\\"));
      test(L"right-square-bracket", std::wstring(L"]"));
      test(L"circumflex-accent", std::wstring(L"^"));
      test(L"circumflex", std::wstring(L"^"));
      test(L"low-line", std::wstring(L"_"));
      test(L"underscore", std::wstring(L"_"));
      test(L"grave-accent", std::wstring(L"`"));
      for (wchar_t c = L'a'; c <= L'z'; ++c)
      {
          const wchar_t a[2] = {c};
          test(a, std::wstring(a));
      }
      test(L"left-brace", std::wstring(L"{"));
      test(L"left-curly-bracket", std::wstring(L"{"));
      test(L"vertical-line", std::wstring(L"|"));
      test(L"right-brace", std::wstring(L"}"));
      test(L"right-curly-bracket", std::wstring(L"}"));
      test(L"tilde", std::wstring(L"~"));
  
      test(L"tild", std::wstring(L""));
      test(L"ch", std::wstring(L""));
      std::locale::global(std::locale("cs_CZ.ISO8859-2"));
      test(L"ch", std::wstring(L"ch"));
      std::locale::global(std::locale("C"));
  }
  