Support new unity versioning scheme with regex matching groups

[AndrewKahr]

Changes

• Support new Unity versioning scheme (https://forum.unity.com/threads/unity-6-new-naming-convention.1558592/)

Checklist

• [x] Read the contribution guide and accept the code of conduct
• [x] Docs (If new inputs or outputs have been added or changes to behavior that should be documented. Please make a PR in the documentation repo)
• [x] Readme (updated or not needed)
• [x] Tests (added, updated or not needed)

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