Date: Mon, 06 Dec 2010 11:29:36 +1030 From: Wayne Sierke <ws@au.dyndns.ws> To: Chip Camden <sterling@camdensoftware.com> Cc: freebsd-questions@freebsd.org Subject: Re: regex question.... Message-ID: <1291597176.2045.18.camel@predator-ii.buffyverse> In-Reply-To: <20101205181945.GC39513@libertas.local.camdensoftware.com> References: <20101205002602.GA27499@thought.org> <AANLkTinXsSHj4kLha9SgR4T0Rn7TvH1cKmZ-pYe%2BgC-k@mail.gmail.com> <4cfaf16b./uHAeLS0wfpxq8FB%perryh@pluto.rain.com> <AANLkTinLu9Uiu0WRfo_-5QDWDnuQG7sXfGqFaVgXAd5u@mail.gmail.com> <20101205043257.GA3854@thought.org> <20101205084403.59ad70e7@gumby.homeunix.com> <20101205181945.GC39513@libertas.local.camdensoftware.com>
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On Sun, 2010-12-05 at 10:19 -0800, Chip Camden wrote: > Quoth RW on Sunday, 05 December 2010: > > On Sat, 4 Dec 2010 20:32:57 -0800 > > Gary Kline <kline@thought.org> wrote: > > > > > On Sat, Dec 04, 2010 at 06:49:45PM -0800, xSAPPYx wrote: > > > > > > Also, the + operator means '1 or more' but needs escaped: > > > > %s/[0-9]\+/foo/g > > > > > > > > > Okay. I thought that the + must be perl-only regex... . > > > > It's from "Extended" REs rather than perl specifically, it works > > with sed -E but not plain sed. Not sure about vi. > For me in works in vim but not in vi. In vi it requires setting the "extended" option which is unset by default - "set all" will display "noextended". In POSIX "extended" REs '+' is a metacharacter so the expression for "sed -E" and vi with "extended" enabled is simply "[0-9]+" (likewise for "grep -E" etc). It seems to be a "gnuism" that an escaped "+" works in "basic" REs, so it works in grep, gnu sed (gsed) etc. -- Wayne
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