code: public static boolean isValid(String kidnummer) {
          try {
              KidnummerValidator.getKidnummer(kidnummer);
              return true;
          } catch (IllegalArgumentException e) {
              return false;
          }
      }
docs: Return true if the provided String is a valid KID-nummmer.
  
  @param kidnummer A String containing a Kidnummer
  @return true or false