#include <iostream>
#include <string>
#include <regex>
int main ()
{
if (std::regex_match ("subject", std::regex("(sub)(.*)") ))
std::cout << "string literal matched\n";
const char cstr[] = "subject";
std::string s ("subject");
std::regex e ("(sub)(.*)");
if (std::regex_match (s,e))
std::cout << "string object matched\n";
if ( std::regex_match ( s.begin(), s.end(), e ) )
std::cout << "range matched\n";
std::cmatch cm;
std::regex_match (cstr,cm,e);
std::cout << "string literal with " << cm.size() << " matches\n";
std::smatch sm;
std::regex_match (s,sm,e);
std::cout << "string object with " << sm.size() << " matches\n";
std::regex_match ( s.cbegin(), s.cend(), sm, e);
std::cout << "range with " << sm.size() << " matches\n";
std::regex_match ( cstr, cm, e, std::regex_constants::match_default );
std::cout << "the matches were: ";
for (unsigned i=0; i<cm.size(); ++i) {
std::cout << "[" << cm[i] << "] ";
}
std::cout << std::endl;
return 0;
}