[Boost-users] finding the index of a partial match with regex_iterator?

From: dave_at_[hidden]
Date: 2006-06-14 19:06:20

hello (and thanks for previous help!),
I'm having some difficulty accessing the location of the beginning of a
successful partial match.  in the callback below, match_results.position()
does give me the index of successful matches.  How do i get it for
partial?  The code does recognize a partial match but what[0].first seems
to be undefined on a partial match. The callback is called 3 times and
does identify the partial but have been totally unable to get that
index..Code is below, thanks alot!
Dave

bool regex_callback(const
boost::match_results<std::string::const_iterator>& what)
{
   cout << "in callback, index is " << what.position(0) << endl;
   if(!what[0].matched)
     cout << "|--is partial " << endl;

   return true;
}

int main(int argc, char *argv[])
  {

    string sMatchMe = "HELLO";
    int theseflags=0;
    boost::regex xreMatchme(sMatchMe, theseflags);
    boost::cmatch xcmMatch;
    string stupid = "sdfaHELLOdsfh*saHELLOdhfas1d3ahsdf%as&d!adfasdfsdHELL";
    boost::sregex_iterator m1(stupid.begin(), stupid.end(), xreMatchme,
boost::match_default | boost::match_partial);
    boost::sregex_iterator m2;
    std::for_each(m1, m2, &regex_callback);
    return 1;
  }