GNU bug report logs - #22655
grep-2.21 (and git master): --null-data and ranges work in an odd way (-P works fine)

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Package: grep;

Reported by: Sergei Trofimovich <slyfox <at> gentoo.org>

Date: Sat, 13 Feb 2016 23:24:01 UTC

Severity: normal

Done: Paul Eggert <eggert <at> cs.ucla.edu>

Bug is archived. No further changes may be made.

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From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Stephane Chazelas <stephane.chazelas <at> gmail.com>
Cc: 22655 <at> debbugs.gnu.org
Subject: bug#22655: grep -Pz '^' now fails!
Date: Sat, 19 Nov 2016 00:09:11 -0800

Stephane Chazelas wrote:
> Why would it make it slower. AFAICT, PCRE_MULTILINE *adds*
> some overhead.

After looking into it I now remember why PCRE_MULTILINE speeds things up. See:

http://git.savannah.gnu.org/cgit/grep.git/commit/?id=f6603c4e1e04dbb87a7232c4b44acc6afdf65fef

where using PCRE_MULTILINE sped up 'grep -P "z.*a"' by a factor of 220.
This bug report was last modified 8 years and 190 days ago.

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