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Regexps cyrillic locale-dependent inclusion

From: Alexandre Garreau <galex-713 at galex-713 dot eu>
To: libc-help at sourceware dot org
Date: Wed, 23 Jan 2019 00:50:53 +0100
Subject: Regexps cyrillic locale-dependent inclusion
Pgp-fingerprint: E109 9988 4197 D7CB B0BC 5C23 8DEB 24BA 867D 3F7F

I checked various letters found on wikipedia [0].

My main system locale is fr_FR.UTF-8.

It goes from standard russian:

(string-match "[а-я]" "ё") => nil

grep '[а-я]' <<<'ё' => ё

LC_ALL=C grep '[а-я]' <<< 'ё' => ё

To very uncommon letters (only present in abkhaz (caucasianlanguage), according wikipedia):


(string-match "[а-я]" "ҩ") => nil

grep '[а-я]' <<< 'ҩ' => ҩ

LC_ALL=C grep '[а-я]' <<<'ҩ' => nil

What is this difference? why a such difference?

[0] https://en.wikipedia.org/wiki/List_of_Cyrillic_letters

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