Subject: bug#22655: grep -Pz '^' now fails!

From: Paul Eggert <[email-masked]>
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.