docs: function validUUID(uuid) {
      // xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx where x is a hexadecimal digit and
      // y is 8,9, A, or B
      var uuidRegex = /^[0-9a-f]{8}\-[0-9a-f]{4}\-4[0-9a-f]{3}\-[89ab][0-9a-f]{3}\-[0-9a-f]{12}$/i,
          result;
  
      result = uuidRegex.exec(uuid);
  
      return result !== null;
  }