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Date: Fri, 29 Jun 2001 14:22:15 -0400
From: Clint Adams <clint@zsh.org>
To: zsh-workers@sunsite.dk
Subject: bracket expressions and POSIX
Message-ID: <20010629142215.A8431@dman.com>
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POSIX says that \ loses its special meaning within a bracket
expression for pattern matching and also that ! is the
^ character in that context.

So this strikes me as non-compliant:

% emulate sh
% touch \\test abc
% echo [!a]*
zsh: event not found: a]
% echo [\!a]*
\test
% echo [\]*
[]*
% echo [\\]*
\test

More specifically, the first three echoes appear to be
non-POSIX-compliant.