Subject: bug#49887: [Feature request] Lookaround assertions in Elisp regexps

From: Brian Leung <[email-masked]>
Date: Thu, 5 Aug 2021 03:56:51 +0200 (CEST)

It would be nice if Emacs Lisp regexps supported positive- and negative-lookahead/behind assertions. After Tomohiro Matsuyama attempted to submit a patch in 2009, there was a subsequent discussion (https://emacs-devel.gnu.narkive.com/cpv75xJJ/patch-for-lookaround-assertion-in-regexp) that suggested some possible avenues but ultimately did not lead to anything concrete.

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