GNU bug report logs - #74861
31.0.50; etags no longer processing shy groups as expected in --regex options

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From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Eli Zaretskii <eliz <at> gnu.org>, dvilleneuve.4142 <at> gmail.com
Cc: 74861 <at> debbugs.gnu.org
Subject: bug#74861: 31.0.50; etags no longer processing shy groups as expected in --regex options
Date: Sat, 14 Dec 2024 11:39:54 -0700

On 12/14/24 01:33, Eli Zaretskii wrote:
> I'm guessing this is because Emacs 27 switched to the Gnulib's regex
> implementation in etags and other lib-src programs, whereas previous
> versions used the Emacs's own regex code (which is still used for
> Emacs's own regex search and replacement code).
> 
> CC'ing Paul Eggert, in the hope he can tell whether this is expected
> or not, or how to fix it.

Yes that's expected, as glibc/Gnulib regex doesn't do shy groups. A 
workaround is to not use shy groups, e.g.:

etags --regex='/DEFINE_FF *(\(TAG \)? *\([^)]+\)/\2/' \
  --output ETAGS-test foo.c

This should be portable between both older and newer etags.

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