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Date: Sat, 9 Oct 2010 16:06:39 -0400
Message-ID: <AANLkTim6KnxvKXbJmUQrUqm+mCBMU=y2maB0PitOfBfC@mail.gmail.com>
Subject: Re: [[ 0 =~ 1 || 1 = 0 ]] returns true
From: Michael Hwang <michael.a.hwang@gmail.com>
To: Mikael Magnusson <mikachu@gmail.com>
Cc: zsh workers <zsh-workers@zsh.org>, brandon@ifup.org
Content-Type: text/plain; charset=ISO-8859-1

% set -x
% [[ 0 =~ 1 || 1 = 0 ]]
+zsh:2> [[ 0 -regex-match 1 || ! 1 == 0 ]]
% [[ 0 =~ 1 || 1 == 1 || 1 = 0 ]]
+zsh:3> [[ 0 -regex-match 1 || ! 1 == 1 ]]
% [[ 0 =~ 1 || 1 == 1 || 1 = 1 || 1 = 1 || 1 = 1 ]]
+zsh:4> [[ 0 -regex-match 1 || ! 1 == 1 ]]

It appears that zsh thinks it needs to invert the second conditional
expression. Also, zsh seems to drop more than two conditional
expressions.

Michael Hwang

On Sat, Oct 9, 2010 at 1:29 PM, Mikael Magnusson <mikachu@gmail.com> wrote:
> % [[ 1 =~ 1 && 0 = 1 ]]; echo $?
> 0
> % [[ 1 =~ 1 || 0 = 1 ]]; echo $?
> 0
> % [[ 1 =~ 0 || 0 = 1 ]]; echo $?
> 0
> % [[ 1 =~ 0 || 1 = 1 ]]; echo $?
> 1
> % [[ 1 =~ 1 || 1 = 1 ]]; echo $?
> 0
> % [[ 1 =~ 1 && 1 = 1 ]]; echo $?
> 1
> % [[ 1 =~ 0 && 1 = 1 ]]; echo $?
> 1
>
> Something seems to be screwy with =~ and &&/||, on its own it appears fine.
>
> --
> Mikael Magnusson
>