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

From: Stephane Chazelas
Subject: bug#22655: grep -Pz '^' now fails!
Date: Fri, 18 Nov 2016 17:46:46 +0000
User-agent: Mutt/1.5.21 (2010-09-15) 
2016-11-18 17:32:59 +0000, Stephane Chazelas:
[...]
> And PCRE_MULTILINE now can only improve performance.
[...]

Sorry, I meant "and *removing* PCRE_MULTILINE now can only
improve performance". (and we need to add PCRE_DOLLAR_ENDONLY or
otherwise printf 'a\n\0' | grep -Pz 'a$' would still match).
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