boost regex 获取 FTP 响应响应消息，boostregex,boost regex获

boost regex 获取 FTP 响应响应消息，boostregex,boost regex获

boost regex获取FTP消息

#include <stdlib.h>#include <boost/regex.hpp>#include <string>#include <iostream>using namespace boost;regex expression("([0-9]+)(\\-| |$)(.*)");// process_ftp: // on success returns the ftp response code, and fills // msg with the ftp response message. int process_ftp(const char* response, std::string* msg){   cmatch what;   if(regex_match(response, what, expression))   {      // what[0] contains the whole string       // what[1] contains the response code       // what[2] contains the separator character       // what[3] contains the text message.       if(msg)         msg->assign(what[3].first, what[3].second);      return std::atoi(what[1].first);   }   // failure did not match    if(msg)      msg->erase();   return -1;