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From: | Paul Eggert |
Subject: | bug#22655: grep -Pz '^' now fails! |
Date: | Sat, 19 Nov 2016 15:12:41 -0800 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.4.0 |
Aaron Crane wrote:
I'm not sure it's ideal to use the Perl documentation as a comprehensive guide to PCRE:
Unfortunately libpcre does not document the regular expression syntax it supports. Neither does the grep manual, for 'grep -P'. And as you've mentioned, the Perl manual isn't a reliable source for libpcre either. So users of 'grep -P' cannot rely on any documentation for behavior; it's an unwritten tradition instead.
Long ago when a friend told me "When you're telling someone else where you plan to throw the Frisbee, don't say anything more specific than 'Watch this!'" That's 'grep -P' in a nutshell.
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