code: @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);
      }
docs: /* (non-Javadoc)
  @see org.jboss.as.cli.operation.OperationParser.CallbackHandler#operationName(java.lang.String)