GNU bug report logs - #26864
Clarification on obscure regular expressions mentioned in known bugs

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Message #8 received at 26864 <at> debbugs.gnu.org (full text, mbox):

From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Sundeep Agarwal <learnbyexample.net <at> gmail.com>
Cc: 26864 <at> debbugs.gnu.org
Subject: Re: bug#26864: Clarification on obscure regular expressions mentioned
 in known bugs
Date: Mon, 30 Dec 2019 01:01:21 -0800

[Message part 1 (text/plain, inline)]

On 5/10/17 1:48 AM, Sundeep Agarwal wrote:

> my question is whether these regular expression examples come under
> 'obscure regular expressions' mentioned in the man page.

No, they're bugs in grep's regular expression implementation, which is taken
from glibc. I filed a bug report against glibc here:

https://sourceware.org/bugzilla/show_bug.cgi?id=25322

and installed the attached patches to GNU grep to try to document this mess
better. The first patch is the important one; the other two merely standardize
spelling and fix a typo in the first patch. Thanks for reporting the problem.

[0001-doc-mention-back-reference-bugs.patch (text/x-patch, attachment)]

[0002-doc-spell-back-reference-more-consistently.patch (text/x-patch, attachment)]

[0003-doc-fix-bug-typo.patch (text/x-patch, attachment)]

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