GNU bug report logs - #65536
30.0.50; replace-regexp-in-string documentation does not mention it saves match data

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Message #8 received at 65536 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Jens Schmidt <jschmidt4gnu <at> vodafonemail.de>
Cc: 65536 <at> debbugs.gnu.org
Subject: Re: bug#65536: 30.0.50;
 replace-regexp-in-string documentation does not mention it saves
 match data
Date: Fri, 25 Aug 2023 17:18:36 +0300

> Date: Fri, 25 Aug 2023 15:16:29 +0200
> From:  Jens Schmidt via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs <at> gnu.org>
> 
> Not sure about this one, maybe I have overlooked something ...
> 
> The Emacs Lisp manual says:
> 
>    Notice that all functions are allowed to overwrite the match data
>    unless they’re explicitly documented not to do so.
> 
> And in particular function `replace-regexp-in-string' could be
> assumed to modify the match data, but it uses an explicit call to
> `save-match-data' to not do so.
> 
> Maybe this should be explicitly documented in its doc string and/or
> the Emacs Lisp manual ((elisp) Search and Replace) so that users of
> the function can rely on that fact?

Is it important to promise never to clobber match-data in this
function?

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