Example on how to use C++ regex_token_iterator

 #pragma once   
 #pragma warning(disable:4996)   
 #define _SCL_SECURE_NO_WARNINGS   
 #include "stdafx.h"  
 #include <fstream>  
 #include <iostream>  
 #include <regex>  
 #include <iterator>  
 #include <algorithm>  
 using namespace std;  
 int main() {  
      string seq("tatagcagtcccgctgtgtgtacgacactggcaacatgaggtctttgctaatcttggtagctttg");  
      regex e("(tata)([gatc]*)(tag)");  
      int submatches[] = { 1, 2, 3 };  
      sregex_token_iterator rend;  
      sregex_token_iterator a(seq.begin(), seq.end(), e, submatches);  
      while (a != rend) std::cout << " [" << *a++ << "]";  
      getchar();  
      return 0;  
 }