#include <iostream>
#include <string>
#include <regex>
 
int main()
{
    std::regex pattern { "abc" }; // on recherche le motif "abc"
    std::string target { "abcdef" };
    bool result = std::regex_match(target, pattern);
    std::cout << std::boolalpha << result << std::endl;
    
    target = "abc";
    result = std::regex_match(target, pattern);
    std::cout << std::boolalpha << result << std::endl;
}