Mirror Modifier should allow mirroring vertex groups that use directional infixes, much like how it already handles prefixes & suffixes

Currently, the mirror modifier also mirrors the vertex groups correctly if it precedes an Armature modifier, but only if the armature's bones have directional prefixes ( L_, r. ) and suffixes ( .l, _R ). This however does not seem to work with any configuration of infixes ( _L_, .r. ).

Although this formatting is less common, I still think it should be something that the mirror modifier handles by default, as it would still help with some workflows, especially in games.

Video example of the mirror modifier correctly mirroring vertex groups with directional suffixes:

And one where the same test fails in the case of bones with directional infixes: