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bug#26864: Clarification on obscure regular expressions mentioned in kno

From: Paul Eggert
Subject: bug#26864: Clarification on obscure regular expressions mentioned in known bugs
Date: Mon, 30 Dec 2019 01:01:21 -0800
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.2.2

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:


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.

Attachment: 0001-doc-mention-back-reference-bugs.patch
Description: Text Data

Attachment: 0002-doc-spell-back-reference-more-consistently.patch
Description: Text Data

Attachment: 0003-doc-fix-bug-typo.patch
Description: Text Data

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