From owner-freebsd-hackers@FreeBSD.ORG  Sun Jan 26 21:18:42 2014
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Subject: Re: Is this a regex bug?
From: Mark Blackman <mark@exonetric.com>
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Date: Sun, 26 Jan 2014 21:10:34 +0000
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On 26 Jan 2014, at 21:04, rank1seeker@gmail.com wrote:

> Or am I crazy?
>=20
> echo '-m' | egrep '^\-[[:alnum:]]+$'
> echo '-n' | egrep '^\-[[:alnum:]]+$'
> echo '-o' | egrep '^\-[[:alnum:]]+$'
>=20
> Guess what?
> Only middle one, '-n' doesn't match it.
> Is this an RE bug or I clearly ain't seeing obvious?!
>=20
> echo '-n' | egrep '^\-[0-9A-Za-z]+$'
>    Doesn't work either
>=20
> 9.2-RELEASE-p3  i386

-n is being interpreted as an option to =91echo=92 and being swallowed =
before it gets to egrep.

- Mark=