#include <iostream>
#include <string>
#include <regex>

int main ()
{
  std::string s ("(32,33),(63,22),(22,1)");
  std::regex e ("[[:d:]]+,(?=.*\\()"); 
  std::string result;

  std::regex_replace (std::back_inserter(result), s.begin(), s.end(), e, "$2");
  std::cout << result;

  return 0;
}