Question

I need to convert const_iterator into a type that I can do int and string operations to.
results[1] contains the text from the regex_search that I need to work with.
I’ve spent a couple hours already trying cast into a workable format, no success…

boost::match_results<std::string::const_iterator> results;
      boost::regex ex(pattern, boost::regex::perl);
      if(boost::regex_search(line, results, ex))
        (results[1] > 10) ? cout << "Fail" : cout << "Pass";

Thanks,
Joe

Answer 1

You could create an std::string out of a match result of const string iterators like this:

std::string result_string( results[1].first, results[1].second );

…or simply:

std::string result_string = results[1].str();

You can coerce the string to an int like this:

int result_int = boost::lexical_cast< int >( result_string );

…or, as pointed by @Jonathan Wakely, if you are using C++11:

int result_int = std::stoi( result_string );