id,summary,reporter,owner,description,type,status,milestone,component,version,severity,resolution,keywords,cc
4837,referencing subexpr matches via names asserts,nis.aggarwal@…,John Maddock,"I am using named subexpressions. The regex pattern constructs fine and the matching works fine too but when I try to index into the match_results object using the name, an assertion is thrown. 

{{{
#include <boost/regex.hpp> 
#include <string> 
#include <iostream> 
#include <stdio.h>

using namespace boost; 

int main()
{
    std::string str = ""for is while"";

    regex pat(""(?<keyword>\\b(for|while)\\b)"");
    sregex_iterator match_iter(str.begin(), str.end(), pat);
    sregex_iterator match_end;

    for (; match_iter != match_end; ++match_iter) {
        smatch match = (*match_iter);

        ssub_match keywordMatch = match[""keyword""];
        if (keywordMatch.matched) {
            printf(""matched a keyword!\n"");
        }
        size_t pos = (*match_iter).position((size_t)0);
        size_t len = (*match_iter)[0].second - (*match_iter)[0].first;
        
        std::cout << pos << "","" << len << std::endl;
    }

    return 0;
}
}}}
",Bugs,closed,To Be Determined,regex,Boost 1.40.0,Showstopper,worksforme,regex named subexpression,