std::string subject("This is a test test");
    try {
        std::regex re("\w+");
        std::sregex_iterator next(subject.begin(), subject.end(), re);
        std::sregex_iterator end;
        while (next != end) {
            std::smatch match = *next;
            std::cout << match.str() << "n";
            std::cout << match.size() << " count" << std::endl;
            next++;
        }
    }