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bug#11309: 24.1.50; Case problems with [:upper:] and Cyrillic, Greek
From: |
Lars Ingebrigtsen |
Subject: |
bug#11309: 24.1.50; Case problems with [:upper:] and Cyrillic, Greek |
Date: |
Mon, 07 Dec 2020 18:24:34 +0100 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) |
Aidan Kehoe <kehoea@parhasard.net> writes:
> (let ((case-fold-search t))
> (string-match "[[:upper:]]" "a\u0686"))
> => 0 ;; As documented
>
> (upcase "\u0430") ;; CYRILLIC SMALL LETTER A
> => "А" ;; "\u0410", so it's in the case table
>
> (let ((case-fold-search t))
> (string-match "[[:upper:]]" "\u0430\u0686"))
> => nil ;; Ah, this is unexpected.
I tried this in Emacs 28, and I can confirm that this behaviour is still
present.
> (let ((case-fold-search t))
> (string-match "[[:lower:]]" "\u0410\u0686"))
> => 0 ;; But this works as documented.
>
> (upcase "\u03b2") ;; GREEK SMALL LETTER BETA
> => "Β" ;; "\u0392", it's in the case table
>
> (let ((case-fold-search t))
> (string-match "[[:upper:]]" "\u03b2\u5357"))
> => nil ;; Oops
>
> (let ((case-fold-search t))
> (string-match "[[:lower:]]" "\u0392\u5357"))
> => 0 ;; But this works, again.
And this, too.
Anybody have any insight here?
--
(domestic pets only, the antidote for overdose, milk.)
bloggy blog: http://lars.ingebrigtsen.no
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Lars Ingebrigtsen <=