While using parameterised pipelines, we came across the situation where we write more steps to validate the variables, than for the build/release itself.

For example when releasing a new maven artefact, we enforce the user to provide the releaseVersion and the developmentVersion manually.

To ensure this, we currently run steps to regex validate each variable.

Allowing to provide a regex for variable validation, and validating it before starting the pipeline would be a great improvement

pipelines:
  custom:
    release:
      - variables:
          - name: releaseVersion
            regex: "[0-9]\\.[0-9]\\.[0-9]"
          - name: developmentVersion
            regex: "[0-9]\\.[0-9]\\.[0-9]-SNAPSHOT"
      - step:
          script:
            - echo "Releasing $releaseVersion"
            - echo "Preparing POM for $developmentVersion"

This would help reduce failed pipelines caused by user input errors, and provide more flexibility to the pipeline developer.