• CI fails
• tests are mandatory for this type of change
• Design of solution is poor - we should not allow and parse any random url
• Does not make since to check if something is a url as part of the is mbid function as these are not the same tasks
• And there's really 0 need for this as if user's can copy the url...then can copy the group part of the url

Will work on it more and get the testing working before revising then, when I get some more time.

Will split mbid and URL out into separate functions if that's what's preferred. And reject any URLs not from musicbrainz.

Personally think it's a very useful function on mobile where text selection and editing is a pain, especially ATM when text search is still getting up to speed and searching by ID is more successful.

I would like to have this feature as well, it's a small pain to have to change the url from https://musicbrainz.org/release-group/381a758e-82bf-403f-85ea-b4f97ed1e0b7 to lidarr:381a758e-82bf-403f-85ea-b4f97ed1e0b7. Why is it even lidarr: instead of mbid:?

Btw any progress on this?
Have you looked at how they did it in Radarr?
Radarr/Radarr#10540 + Radarr/Radarr@f90b43b

If it were me I would use a regex like \bmusicbrainz\.org\/(?:artist|release-group)\/([0-9a-f]{8}-[0-9a-f]{4}-[0-5][0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12})\b and take the result of the capture group for the MBID.
Heck, even just \bmusicbrainz\.org\/(?:artist|release-group)\/([\d\w-]+)\b is enough if you ask me, why bother with matching valid UUID, by that logic we could even make sure it's the UUID version 4 variant 1 that MBID seems to be using (\bmusicbrainz\.org/(?:artist|release-group)/([0-9a-f]{8}-[0-9a-f]{4}-4[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12})\b ). Just let search sort it out, I don't think the unreadability is worth the unlikely happening of bad searches from incomplete copying of urls. It doesn't seems to be checking currently either with lidarr:.

Could even use the same regex to extract from the original format, but I think it again makes it less readable \b(?:lidarr:|musicbrainz\.org\/(?:artist|release-group)\/)([\d\w-]+)\b