Hi Eric, I'm trying to build a parser, this time with boost.xpressive instead of using boost.spirit. In spirit I have this function that displays when parsing failed: template< class ParseInfo > void printParsingError( boost::sub_range<std::string> range, const ParseInfo& info ) { std::cerr << "\n\n" << "Parsing of file failed. The parser matched:\n\n" << "-------------------------------------------\n[start]"; std::cerr << std::string( range.begin(), info.stop ); std::cerr << "[stop]\n"; std::cerr << "\nThe input was:\n\n" << "-------------------------------------------\n[start]"; std::cerr << std::string( range.begin(), range.end() ); std::cerr << "[stop]\n"; std::cerr << std::endl; } Can I get the same info with xpressive somehow? Thanks -Thorsten