linux-kernel - Re: [PATCH] printk: Remove no longer used second struct cont

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Date:   Thu, 15 Dec 2016 22:04:25 -0800
From:   Joe Perches <joe@...ches.com>
To:     Junio C Hamano <gitster@...ox.com>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        git <git@...r.kernel.org>,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        Petr Mladek <pmladek@...e.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Mark Rutland <mark.rutland@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] printk: Remove no longer used second struct cont

On Thu, 2016-12-15 at 21:00 -0800, Junio C Hamano wrote:
> Joe Perches <joe@...ches.com> writes:
> 
> > grep 2.5.4 was the last version that supported the -P option to
> > grep through for multiple lines.
> 
> Does anybody know why it was dropped?

perl compatible regexes in grep have always been "experimental"
and never officially supported.

>From the grep manual https://www.gnu.org/software/grep/manual/grep.html

    --perl-regexp

        Interpret the pattern as a Perl-compatible regular expression
    (PCRE). This is highly experimental, particularly when combined with
    the -z (--null-data) option, and ‘grep -P’ may warn of unimplemented
    features. See Other Options.


It wasn't dropped so much as "enhanced" away.

Oh well.