From: tlaronde@polynum.com
To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
Subject: Re: [9fans] empty *
Date: Thu, 14 Jun 2012 16:00:47 +0200 [thread overview]
Message-ID: <20120614140047.GA1725@polynum.com> (raw)
In-Reply-To: <301f8dfa8383d61d620e4412292986f8@kw.quanstro.net>
On Thu, Jun 14, 2012 at 09:44:25AM -0400, erik quanstrom wrote:
> > > nope, that's not right. * starting a pattern escapes the whole string.
> > > this is unique to grep.
I guess this is surprising because with a POSIX grep(1), if I read the
description correctly:
1) If the * is the very character of a BRE (since POSIX has BRE and ERE)
it shall be treated as is---but the remaining of the expression is
interpreted.
2) In a ERE, if the * is the very first character, or follows |,
^ or ( this is undefined.
But I must admit that I was unaware, till Erik's message, of both the
Plan9 behavior, and even the "details" of the POSIX behavior...
--
Thierry Laronde <tlaronde +AT+ polynum +dot+ com>
http://www.kergis.com/
Key fingerprint = 0FF7 E906 FBAF FE95 FD89 250D 52B1 AE95 6006 F40C
next prev parent reply other threads:[~2012-06-14 14:00 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CACm3i_g9m6sVaBvvydKYyBxwE=NGYmhmpM4Nko6gE5uUngSwXA@mail.gmail.c>
2012-06-14 13:33 ` erik quanstrom
2012-06-14 13:38 ` Gorka Guardiola
[not found] ` <CACm3i_hoeuq10w5=Ri+-nocm1Str2USwTBW1m5iuhSxdU3_pMA@mail.gmail.c>
2012-06-14 13:44 ` erik quanstrom
2012-06-14 14:00 ` tlaronde [this message]
2012-06-14 14:13 ` Gorka Guardiola
2012-06-14 14:36 ` tlaronde
2012-06-14 14:49 ` erik quanstrom
2012-06-14 15:08 ` tlaronde
[not found] ` <CACm3i_hRKnkDW6SgFQQ3B4zfr3UHim=-x_uA0iYYRzZz0W8Xag@mail.gmail.c>
2012-06-14 14:46 ` erik quanstrom
2012-06-14 14:50 ` Gorka Guardiola
2012-06-14 14:05 ` Lucio De Re
2012-06-14 8:28 Gorka Guardiola
2012-06-14 9:32 ` Peter A. Cejchan
2012-06-14 9:54 ` Gorka Guardiola
2012-06-14 9:42 ` Anthony Martin
2012-06-14 13:29 ` erik quanstrom
[not found] ` <CAM6ozu51kzDLxB0KoT96udomrKyHWuHvwqSum6=aXmonpr8kXQ@mail.gmail.c>
2012-06-14 13:28 ` erik quanstrom
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