Follow-up Comment #1, bug #32337 (project grep):
The man page here is misleading. [:alnum:] does not mean a-zA-Z0-9, it means
"the set of characters with the letter and/or number property in the current
locale".
Grep's behavior is correct here, but the man page could do with improvement.
Suggested rewording:
For example, [[:alnum:]] means the character class of numbers and letters in
the current locale (in the C locale and ASCII character set encoding, this is
the same as [0-9A-Za-z]).
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