docs: @Override
      public void operationName(int index, String operationName)
              throws OperationFormatException {
  
          if (operationName == null || !ALPHANUMERICS_PATTERN.matcher(operationName).matches()) {
              throw new OperationFormatException("'" + operationName + "' is not a valid operation name.");
          }
  
          validatedOperationName(index, operationName);
      }