From mboxrd@z Thu Jan  1 00:00:00 1970
Date: Thu, 22 Feb 2007 18:21:17 -0500
From: William Josephson <jkw@eecs.harvard.edu>
To: Fans of the OS Plan 9 from Bell Labs <9fans@cse.psu.edu>
Subject: Re: [9fans] regular expressions in plan9 different from the ones in
	unix? (at least linux)
Message-ID: <20070222232117.GA20891@mero.morphisms.net>
References: <20070222221625.GQ8206@vanheusden.com>
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On Thu, Feb 22, 2007 at 11:16:26PM +0100, Folkert van Heusden wrote:
> A user of a program of mine (http://www.vanheusden.com/multitail/) tries
> to use plan9 regexps under linux and doesn't succeed.
> Am I right that plan9 regular expressions are not compatible with the
> ones of "regular" unix?

Many unix programs don't use ``extended'' regular expressions by
default.  See regexp(7) on Plan 9 or try egrep/grep -E under Unix.