action.yml

name: Validate PR title
description: Validate pull request title against a regex
inputs:
  title:
    description: Pull request title
    required: true
  pattern:
    description: Regex pattern the PR title must match
    required: true
  error_message:
    description: Custom error message
    required: false
    default: Pull request title does not match required format
runs:
  using: composite
  steps:
    - name: Validate PR title
      shell: bash
      run: |
        title="${{ inputs.title }}"
        pattern="${{ inputs.pattern }}"
        message="${{ inputs.error_message }}"

        echo "PR title: $title"
        echo "Required pattern: $pattern"

        if [[ "$title" =~ $pattern ]]; then
          echo "PR title is valid"
        else
          echo "::error::$message"
          exit 1
        fi