RegexMatch, C++ (gcc)

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//g++  7.4.0
//RegexMatch
//this code is created by Rezaul Hoque on February 21,2022;contact: jewelmrh@yahoo.com,Dhaka, Bangladesh
//note: codes shared by Rezaul Hoque on rextester are not for sale; they are created and shared to facilitate the algorithm learning process; many like Hoque use this platform to practice programming ;Rezaul hopes his contribution helps others to fine tune their learning;
#include <iostream>
#include <string>
#include <regex>

int main ()
{

if (std::regex_match("Holistic", std::regex("([hH]ol)(.*)") ))
    std::cout << "string literal matched\n";

const char csl[] = "Holistic";
  std::string so ("Holistic");
  std::regex rg ("([hH]ol)(.*)");

if (std::regex_match (so,rg))
    std::cout << "string object matched\n";

if ( std::regex_match ( so.begin(), so.end(), rg ) )
    std::cout << "range matched\n";

std::match_results<const char*> cm;    
  std::regex_match (csl,cm,rg);
  std::cout << "string literal with " << cm.size() << " matches\n";

std::match_results<std::string::const_iterator> sm;    
  std::regex_match (so,sm,rg);
  std::cout << "string object with " << sm.size() << " matches\n";

std::regex_match ( so.cbegin(), so.cend(), sm, rg);
  std::cout << "range with " << sm.size() << " matches\n";

std::regex_match ( csl, cm, rg, std::regex_constants::match_default );

std::cout<<"And the match:\n";
  for (unsigned i=0; i<cm.size(); ++i) {
    std::cout << "[" << cm[i] << "] ";
  }

std::cout << std::endl;

return 0;
}

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Compilation time: 7.68 sec, absolute running time: 0.18 sec, cpu time: 0.01 sec, memory peak: 5 Mb, absolute service time: 7,91 sec