... but ...

The testsuite should have also included markup which must not be replaced

My fault sorry, I thought it's obvious by the $pre and $post regex.

The markup must come in pairs and be embraced by special word boundaries.

(whitespace or other markup or tag-brackets or ... depending on pre/post)

Hence a _ inside a word is forbidden, which makes sense for joined_identifiers .

I've updated the tests in Re: wiki regex reprocessing replacement (UPDATED^2) with markup to ignore