#include <iostream>
#include <string>

#include <boost/regex.hpp>

int main()
{
    boost::regex test_regex("a?a?a?a?a?a?a?a?a?a?a?a?a?a?a?"
                            "a?a?a?a?a?a?a?a?a?a?a?a?a?a?a?"
                            "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa");
    std::string test_string("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa");

    if (regex_match(test_string, test_regex)) {
        std::cout << "ok\n";
    } else {
        std::cout << "no\n";
    }
}