group1 empty on perfect regex match

[Tchekda]

What happened

When running this action :

      - name: Extract version number
        id: version
        uses: actions-ecosystem/action-regex-match@v2
        with:
          text: ${{ github.event.head_commit.message }}
          regex: '.*(v\d+\.\d+\.\d+).*'
      - name: Create Release
        if: ${{ steps.version.outputs.match != '' }}
        uses: marvinpinto/action-automatic-releases@latest
        with:
          repo_token: "${{ secrets.GITHUB_TOKEN }}"
          prerelease: false
          automatic_release_tag: ${{ steps.version.outputs.group1 }}
          title: Version ${{ steps.version.outputs.group1 }}

With the commit message v0.0.8, the second step is triggered so steps.version.outputs.match isn't empty but steps.version.outputs.group1 is empty that creates an error on the following step. But when the commit message is v0.0.8 - 2nd try it's working fine and the steps.version.outputs.group1 contains correctly the version number.

Regex101 proof

What you expected to happen

I expected the regex to match the whole message as expected and put it in steps.version.outputs.group1

How to reproduce it

Use these steps on an action triggered by push and create a commit matching perfectly the regex

Environment

These action are set with runs-on: ubuntu-latest

[kaisugi]

Actually, you cannot use \d+ because this workflow exploits JavaScript's constructor Regex internally.
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/RegExp#literal_notation_and_constructor

> const re1 = new RegExp("\d+", "");   # constructor
undefined
> re1.exec("34");
null
> const re2 = new RegExp(/\d+/, "");   # literal notation
undefined
> re2.exec("34");
[ '34', index: 0, input: '34', groups: undefined ]

[kaisugi]

In your case, .*(v.+?\..+?\..+?).* would work perfectly fine

> const re = new RegExp(".*(v.+?\..+?\..+?).*", "");
undefined
> re.exec("v0.0.8")
[ 'v0.0.8', 'v0.0.8', index: 0, input: 'v0.0.8', groups: undefined ]
> re.exec("v0.0.8 - 2nd try")
[
  'v0.0.8 - 2nd try',
  'v0.0.8',
  index: 0,
  input: 'v0.0.8 - 2nd try',
  groups: undefined
]

[Tchekda]

Understood. I was more looking for something that would match only numbers but that is good too.

Thank you for your answer, sorry for bothering...