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Date: Thu, 3 Sep 2015 00:07:11 +0100
From: Stephane Chazelas <stephane.chazelas@gmail.com>
To: Zsh hackers list <zsh-workers@zsh.org>
Subject: invalid characters and multi-byte [x-y] ranges
Message-ID: <20150902230711.GA4967@chaz.gmail.com>
Mail-Followup-To: Zsh hackers list <zsh-workers@zsh.org>
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User-Agent: Mutt/1.5.21 (2010-09-15)

Hello,

is this (in a UTF-8 locale):

$ zsh -c $'[[ \xcc = [\uaa-\udd] ]]' && echo yes
yes

expected or desirable? I know I can't expect much since \xcc is
not a valid character, but I wouldn't have expected it to match
[\uaa-\udd] there.

Same for:

$ zsh -c $'[[ \xcc = [[:alpha:]] ]]' && echo yes
yes

It seems \xcc is treated as U+00CC here (which in UTF-8 is
\xc3\x8c)

$ zsh -c $'[[ \xcc = \ucc ]]' && echo yes
$ zsh -c $'[[ \xcc = [\ucc] ]]' && echo yes
yes

-- 
Stephane