Some years ago, the
Find & Replace feature of RStudio didn't have the capability of replacing captured regex groups with lower/upper cases, due to the fact of being implemented with PCRE library, as explained in this answer.
I wonder if this behaviour has changed in last updates, if the library has been updated (I see in the web of PCRE that it has a version PCRE2 -which does RStudio use?-) or if it has been changed by another regex library like boost.
Or maybe, it could be a suggested feature for the near future. Would it be possible?