Is RegEx replacement limited on purpose?

I’m using Anki on Macos and was excited to find the the find and replace support RegEx but as far as I can tell the replacement string is limited to $1 and literal text. I’m trying to use \L and \U in the replace strings and I just get that as a literal replacement. Is this a know bug or on purpose? I’ve googled extensively and found other complaints/questions but no firm answers. Thank you

Find and Replace docs refers to this detailed regex syntax description where you can see all supported options.

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Thank you!