Question on Boost sregex_token_iterator end

[DexterMorgan]

Sample code from boost regex package:

#include <iostream>
#include <boost/regex.hpp>

using namespace std;

int main(int argc)
{
   string s;
   do{
      if(argc == 1)
      {
         cout << "Enter text to split (or \"quit\" to exit): ";
         getline(cin, s);
         if(s == "quit") break;
      }
      else
         s = "This is a string of tokens";

      boost::regex re("\\s+");
      boost::sregex_token_iterator i(s.begin(), s.end(), re, -1);
      boost::sregex_token_iterator j;

      unsigned count = 0;
      while(i != j)
      {
         cout << *i++ << endl;
         count++;
      }
      cout << "There were " << count << " tokens found." << endl;

   }while(argc == 1);
   return 0;
}

Question: is there a nicer way to figure out when the iterator "i" ends rather than comparing it to "j" (in the while loop) defined just for this purpose ?
Or does it require analysis of the regex_token_iterator template ? If so, I shall investigate it later when I read up on templates :)