Hi, I finally upgrade to boost 1.31; as I got compile errors around the regex_grep stuff I decided to switch to regex_iterator. 1. It would be helpful if the top page of the docs had direct links to explanations of smatch and similar classes. 2. An example of how to use sub_match would be useful. The C++ parser example for regex_iterator is not ideal because: a) the regex is rather complex; b) the callback just uses str(), and never shows the type to use if you want to iterate through each character in the match. 3. I get this error (see P.S. for my code) `iterator' is not a member of type `boost::sub_match<__gnu_cxx::__normal_iterator<const char*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > > >' but this page says sub_match has an iterator type. libs/regex/doc/sub_match.html It compiles when I explicitly use std::string::const_iterator. Darren P.S. Cut down, my code looks like: bool parse(const boost::smatch::value_type &crd,const std::string &status){ //... boost::smatch::value_type::iterator p=crd.first; // <-- won't compile //std::string::const_iterator p=crd.first; // <-- compiles while(p<crd.second){ ... } //... } //In class Functor: bool operator()(const boost::match_results<std::string::const_iterator>& m){ //... bool ok=parse(m[1],m.str(2)); //... } std::string comment; //The string to parse boost::regex status_re("..."); Functor callback(...); boost::sregex_iterator m1(comment.begin(), comment.end(), status_re); boost::sregex_iterator m2; if(m1==m2)return 0; std::for_each(m1, m2, callback);