Oh and

REReplace

and

REReplaceNoCase

both seems to support the

callback

feature from

Replace

and

ReplaceNoCase

(added in 2021) but seems to be completely undocumented as to what the parameters are to the callback (there is an example on

REReplace

page but no explanation).

ReReplaceNoCase

reference doesn't mention it at all and even the example is for

ReReplace

not

ReReplaceNoCase