This action checks for the presence or absence of a word in the body or diff in a PR, as well as the number of lines and files changed. If fails if one or more of the set criteria isn't met.

You need to add this in a file in .github/workflows and set appropriate options.

name: "Check PR content"
on: [pull_request]

jobs:
  check_pr:
    runs-on: ubuntu-latest
    steps:
    - name: Check PR
      uses: jsoares/gh-pr-content-checker@master
      with:
        github-token: ${{github.token}}
        bodyContains: 'Add this'
        bodyDoesNotContain: "Delete this"        
        diffContains: 'Add this'
        diffDoesNotContain: "Delete this"   
        diffContainsRegex: '<regex here>'
        diffDoesNotContainRegex: '<regex here>'
        maxLinesChanged: 1
        maxFilesChanged: 1

An example is also provided in .github/workflows/ in this repository.

This is a customisation of jsoares/gh-pr-content-checker, adding regex

• v0: Proof of concept, published to marketplace
• v1: Adds several more checks
• v2: Adds check for strings to avoid and creates issues for errors.

--forked--

• v3: Adds diffDoesNotContain field, improves counting behaviour, update deps

--forked--

• v4: Adds regex checking

This is a modification of jsoares/gh-pr-content-checker and is released under the MIT license.