[bug #28275] Ranges like [a-z] incorrectly match in UTF systems

[Makar]

Follow-up Comment #4, bug #28275 (project grep):

Does [a-z] mean any Latin-based symbol? Does [а-я] mean any extended
Cyrillic? Is this behavior in glibc by design? Thanks for the explanation.

Still, in Perl mode bracket expressions work incorrectly with non-ASCII
symbols.

grep -Poha '[бв]' random-symbols.txt 

treats the expression in brackets as 4 1-byte synbols: 'xd0xb1xd0xb2'. It
gives a column of 1-byte symbols xb1 xb2 and xd0.

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