How to match with github tag version that are not directly a version? (ex: n8.0.0)?

[moi15moi]

How are you running Renovate?

Self-hosted Renovate

Which platform you running Renovate on?

GitHub.com

Which version of Renovate are you using?

No response

Please tell us more about your question or problem

I'm trying to define a customManager with ffmpeg that would depend in this repos https://github.com/FFmpeg/FFmpeg

  "customManagers": [    
    {
      "customType": "regex",
      "managerFilePatterns": ["/^dependencies\\.txt$/"],
      "matchStrings": ["dav1d=(?<currentValue>.*?)\\n"],
      "datasourceTemplate": "gitlab-tags",
      "registryUrlTemplate": "https://code.videolan.org",
      "packageNameTemplate": "videolan/dav1d"
    },
    {
      "customType": "regex",
      "managerFilePatterns": ["/^dependencies\\.txt$/"],
      "matchStrings": ["ffmpeg=(?<currentValue>.*?)\\n"],
      "datasourceTemplate": "github-tags",
      "packageNameTemplate": "FFmpeg/FFmpeg"
    }
  ]

The problem is that all ffmpeg tag (https://github.com/FFmpeg/FFmpeg/tags) start with a n.

I believe using versioningTemplate could help, but the doc doesn't have any example.

Logs (if relevant)

No response

[moi15moi]

Oh, actually, there was some doc available here: https://docs.renovatebot.com/modules/versioning/regex/

This seems to work:

    {
      "customType": "regex",
      "managerFilePatterns": ["/^dependencies\\.txt$/"],
      "matchStrings": ["ffmpeg=(?<currentValue>.*?)\\n"],
      "datasourceTemplate": "github-tags",
      "packageNameTemplate": "FFmpeg/FFmpeg",
      "versioningTemplate": "regex:^n(?<major>\\d+)\\.(?<minor>\\d+)(?:\\.(?<patch>\\d+))?(?<prerelease>[^.-]+)?$"
    }