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Date: Tue, 05 Apr 2011 10:23:38 -0600
From: Eric Blake <eblake AT redhat DOT com>
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To: Jim Garrison <Jim DOT Garrison AT troux DOT com>, cygwin <cygwin AT cygwin DOT com>
Subject: Re: grep problem?
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http://cygwin.com/acronyms/#PPIOSPE - redirecting to the list

On 04/05/2011 10:20 AM, Jim Garrison wrote:

>> POSIX states that range expressions (such as [A-Z]) are undefined in
>> any
>> locale except C; and some locales (like en_US.UTF-8) happen to treat A-
>> B
>> as AaB, A-b as AaBb, and so forth (that is, they collate
>> case-insensitively).
>>
>=20
> Interesting.  I assumed it had to do with collation, but curiously, on Fe=
dora 10 I get different results:

Not all en_US.UTF-8 locale implementations are created equal.  Some
implementations of that locale have taken additional measures to make
collation vs. range computation try to behave saner.

> I'm confused.  Is Fedora 10 wrong?

Not necessarily wrong, just different.

Which is why POSIX states that outside of the C locale, range
expressions are non-portable.

--=20
Eric Blake   eblake AT redhat DOT com    +1-801-349-2682
Libvirt virtualization library http://libvirt.org


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