boost 的match操作,怎么老不成功?

khyang

#include <cstdlib>
#include <stdlib.h>
#include <boost/regex.hpp>
#include <string>
#include <iostream>
#include <fstream>

#include <time.h>

using namespace std;
using namespace boost;


//
// problem with std::getline under MSVC6sp3
istream& mgetline(istream& is, std::string& s)
{
   s.erase();
   char c = is.get();
   while(c != '\n')
   {
      s.append(1, c);
      c = is.get();
   }
   return is;
}


int main(int argc, char**argv)
{        /*
        //redirect its standard input to the standard input of a file.
        ifstream ifs;
        streambuf* pbuf = 0;
        if(argc == 2)
        {
                ifs.open(argv[1]);
                if(ifs.bad())
                {
                        cout << "Bad filename: " << argv[1] << endl;
                        return -1;
                }
                pbuf = cin.rdbuf(ifs.rdbuf());
        }
        */
        //get first string in the file
        string str_in, str_out;
        //mgetline(cin, str_in);
        str_in = " ch ontains a message stringquitquitThe book cost $12.34.";
        cout << str_in <<endl;
       
   //regex expression("\\b.*\\b");
   regex expression("\\$(\\d+)(\\.(\\d\\d))?");
   
   // msg with the ftp response message.
   //int process_ftp(const char* response, std::string* msg)
   //{
   cmatch what;
   int result = -1;
   if(regex_match(str_in.c_str(), 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(str_out)
      cout << "Success! " << endl;
      //str_out.assign(what[3].first, what[3].second);
      //result = ::atoi(what[1].first);
   }
#if 0


      if(result != -1)
      {
         cout << "Match found:" << endl;
         cout << "Response code: " << result << endl;
         cout << "Message text: " << str_out << endl;
      }
      else
      {
         cout << "Match not found" << endl;
      }
      cout << endl;
              // failure did not match
   //if(str_out)
      //str_out.erase();
#endif
   cout<< "Exit." << endl;
   return 0;
}



y68351@l09946c /usr/local/boost_1_33_1/libs/regex/example
$ ./regex_match.exe
ch ontains a message stringquitquitThe book cost $12.34.
Exit.