bug#26864: Clarification on obscure regular expressions mentioned in known bugs

[Paul Eggert]

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
Description: Text Data

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

0003-doc-fix-bug-typo.patch
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