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 charT, class traits = regex_traits<charT>> class basic_regex;
  
  // template <class InputIterator>
  //    basic_regex&
  //    assign(InputIterator first, InputIterator last,
  //           flag_type f = regex_constants::ECMAScript);
  
  #include <regex>
  #include <cassert>
  
  #include "test_macros.h"
  #include "test_iterators.h"
  
  int main(int, char**)
  {
      typedef cpp17_input_iterator<std::string::const_iterator> I;
      typedef forward_iterator<std::string::const_iterator> F;
      std::string s4("(a([bc]))");
      std::regex r2;
  
      r2.assign(I(s4.begin()), I(s4.end()));
      assert(r2.flags() == std::regex::ECMAScript);
      assert(r2.mark_count() == 2);
  
      r2.assign(I(s4.begin()), I(s4.end()), std::regex::extended);
      assert(r2.flags() == std::regex::extended);
      assert(r2.mark_count() == 2);
  
      r2.assign(F(s4.begin()), F(s4.end()));
      assert(r2.flags() == std::regex::ECMAScript);
      assert(r2.mark_count() == 2);
  
      r2.assign(F(s4.begin()), F(s4.end()), std::regex::extended);
      assert(r2.flags() == std::regex::extended);
      assert(r2.mark_count() == 2);
  
    return 0;
  }
  