#include <iostream>                /* C++ iostream            C++98/11 */
#include <string>                  /* C++ strings             C++98/11 */
#include <boost/regex.hpp>
#include <boost/algorithm/string/find.hpp>/* RegEx                   Boost  */
 
int main() {
 
  /* Our strings and string forms for the regualr expressions. */
  std::string id{"station_RTL-158456_datumi_datumi"};
  boost::iterator_range<std::string::const_iterator> firstOccurence = boost::find_nth(id, "_", 0);
  boost::iterator_range<std::string::const_iterator> secondOccurence = boost::find_nth(id, "_", 1);
  std::string program_id{firstOccurence.end(), secondOccurence.begin()};
  std::cout << program_id;
 
}

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