GitHub Actions variable regex replacement

Question

I am trying to prepare artifact name prefix using GitHub Actions that will replace project name special characters with hyphens. I have this piece of code:

strategy:
 matrix:
 project:
 - Common/Helpers.Tests
 - PlaywrightXunitParallel
- name: Set artifact prefix
 id: artifact_prefix
 run: |
 PROJECT_NAME=${{ matrix.project }}
 ARTIFACT_PREFIX=${PROJECT_NAME/[^A-Za-z0-9\-]/-}
 echo "::set-output name=lowercase::${ARTIFACT_PREFIX,,}"

However, I realized that regex is performed only once and result for project Common/Helpers.Tests is common-helpers.tests instead of common-helpers-tests.

I have tried to mark it as global like this: ARTIFACT_PREFIX=${PROJECT_NAME/[^A-Za-z0-9\-]/-/g} but it is not working as expected.

How can I replace all occurrences of special characters from project name?

Link to repo: https://github.com/gucu112/CSharpAutomation/actions/runs/18258362933#artifacts

• Sébastien Guarnay: Use // to replace all occurrences, instead of g at the end: ARTIFACT_PREFIX=${PROJECT_NAME//[^A-Za-z0-9-]/-}