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Date:	Fri, 5 Sep 2025 12:39:58 +1000
To:	cygwin AT cygwin DOT com
Subject:	Re: bash 5.2.21-1: a bug in [0-9] expansion
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From:	Duncan Roe via Cygwin <cygwin AT cygwin DOT com>
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On Sun, Aug 31, 2025 at 12:06:09PM -0700, cygwin wrote:
> Description of the problem.
> [0-9]  picks also certain Unicode superscript characters ( namely, ⁰ ⁴ ⁵ ⁶
> ⁷ ⁸ ⁹ ), and every Unicode subscript character.
> 
> Example: the directory has the following files:
> $ /bin/ls
> ₀.txt  ₁.txt  ₂.txt  ₃.txt  ₄.txt  ₅.txt  ₆.txt  ₇.txt  ₈.txt  ₉.txt
> ⁰.txt  ¹.txt  ².txt  ³.txt  ⁴.txt  ⁵.txt  ⁶.txt  ⁷.txt  ⁸.txt  ⁹.txt
> 
> $ /bin/ls [0-9].txt
> ₀.txt  ₁.txt  ₃.txt  ⁴.txt  ⁵.txt  ⁶.txt  ⁷.txt  ⁸.txt
> ⁰.txt  ₂.txt  ₄.txt  ₅.txt  ₆.txt  ₇.txt  ₈.txt
> 
> $ locale
> LANG=en_US.UTF-8
> LC_CTYPE="en_US.UTF-8"
> LC_NUMERIC="en_US.UTF-8"
> LC_TIME="en_US.UTF-8"
> LC_COLLATE="en_US.UTF-8"
> LC_MONETARY="en_US.UTF-8"
> LC_MESSAGES="en_US.UTF-8"
> LC_ALL=
> 
> System.
> Fully up to date Windows 11
> cygwin 3.6.4-1
> bash    5.2.21-1
> 
This reproduces under Linux with the newest available bash versions.

Rather than post the gory details of what I think is the underlying cause, I'll
report it as a bash issue and post a link to the report.

Cheers ... Duncan.

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