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From: Dimitar Yurukov <mscalindt@gmail.com>
To: harald@gigawatt.nl
Cc: dash@vger.kernel.org, mscalindt@gmail.com
Subject: Re: [PATCH] expand: Recognize '^' as a negation character in BE
Date: Fri, 16 Jul 2021 15:46:05 +0300	[thread overview]
Message-ID: <20210716124605.18722-1-mscalindt@gmail.com> (raw)
In-Reply-To: <0c417093-cc75-7ac6-c2a8-6b46041168c8@gigawatt.nl>

On 16/07/2021 11:00, Harald van Dijk wrote:
> On 16/07/2021 10:42, Dimitar Yurukov wrote:
> > While parsing bracket expression ('[...]'), DASH recognizes only '!' as
> > a special character for negation/inversion, but POSIX specifies '^'.
> > 
> > The POSIX specification (2018 edition) states:
> > 
> >    ^ The <circumflex> shall signify a non-matching list expression when
> >      it occurs first in a list, immediately following a
> >      <left-square-bracket> (see RE Bracket Expression).
> 
> It also states:
> 
>    the <exclamation-mark> character ( '!' ) shall replace the
> <circumflex> character ( '^' ) in its role in a non-matching list in the
> regular expression notation
> 
> and
> 
>    A bracket expression starting with an unquoted <circumflex> character
> produces unspecified results.
> 
> See 2.13.1 Patterns Matching a Single Character.

Oh, my bad, sorry for the noise.

> The patch may still be worthwhile to increase compatibility, but in that
> case the same change also needs to be made to expmeta().

Oops, you are right. Will attach v2.

  reply	other threads:[~2021-07-16 12:46 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-16  9:42 Dimitar Yurukov
2021-07-16 10:00 ` Harald van Dijk
2021-07-16 12:46   ` Dimitar Yurukov [this message]
2021-07-16 12:50 ` [PATCH v2] " Dimitar Yurukov
2021-07-19  5:13   ` Herbert Xu

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