#include <regex>

void Func () {
  std::string s("subject");
  std::regex e ("(sub)(.*)");
  std::regex_match();	                            // <--- ERROR: no such function
  if (std::regex_match (s,e))                       // <--- OK
      std::cout << "string object matched\n";

  if ( std::regex_match ( s.begin(), s.end(), e ) ) // <--- OK
      std::cout << "range matched\n";
}