Can any one tell me how to specify "Multiline" search while using regex? e.g. std::string fb; // fb stores a fragment of html code, multiline; boost::regex pattern("</tr>\r\n</table>\r\n</td>\r\n</tr>\r\n</table>\r\n</td>\r\n</tr>\r\n</table>"); boost::smatch res; boost::match_flag_type flags = boost::match_default; std::string::const_iterator s , e; s = fb.begin(); e = fb.end(); if(boost::regex_search(s, e, res, pattern, flags)) { //process the match. } else { //I am always here } When I use some other regex tools to check the same target string and match pattern string, I always get the right thing as expected. How can I alter the option of boost::regex_search to satisfy the original request? thanks -- This is my Very Signature. Ha, pretty good?