CI variables in rules regexp

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Summary

I'd like to make my gitlab-ci as generic as possible by defining rules using variables to trigger the pipelines. To that end, I would also like to use variable values in the regexp of my rules.

Example configuration

Here's the sample of my gitlab-ci code:

variables:
  JAVA_PROJECTS: ressources|calculateur

.onJavaTag:
  rules:
    - if: '$CI_COMMIT_TAG =~ /($JAVA_PROJECTS)@(.+)/'

Example Project

I've setup a small test repo with that gitlab-ci here: https://gitlab.com/ArtyMaury/gitlab-ci-bug

Desired behavior

The pipeline should be triggered on a ressources@1.0.0 tag

---

Workaround via inputs

This example from the comments shows how to use variables with regexp via expand_vars.

# .gitlab-ci.yml

include:
  - local: my_template.yml
    inputs:
      my_var: $MY_VAR  # Defined as a Project variable with value: "my_test|my_value"

# my_template.yml

spec:
  inputs:
    my_var:
---

test-job:
  script: echo
  rules:
    - if: '"my_value" =~ /^($[[ inputs.my_var | expand_vars ]])$/'

Full configuration:

This results in test-job added to the pipeline.

NOTE: expand_vars currently only supports the same variables available to include. Documentation: https://docs.gitlab.com/ee/ci/yaml/inputs.html#expand_vars – so variables defined with the global or job-level variables: keyword cannot be expanded. Neither can job-level predefined variables.