docs: public static int locate(String search, String s, Integer start) {
  
          if (s == null || search == null) {
              return 0;
          }
  
          int i = (start == null) ? 0
                                  : start.intValue() - 1;
  
          return s.indexOf(search, (i < 0) ? 0
                                           : i) + 1;
      }