docs: public void removeLeadingField(String sourceField, String targetField, String regexString, String length) {
          TransformationStep step = new TransformationStep();
          step.setSourceFields(sourceField);
          step.setTargetField(targetField);
          step.setOperationParameter(TransformationConstants.REMOVELEADING_LENGTH_PARAM, length);
          step.setOperationParameter(TransformationConstants.REGEX_PARAM, regexString);
          step.setOperationName("removeleading");
          steps.add(step);
      }