bug#19878: 24.4; Syntax class [:alpha:] wrongly matches the Indian digits ۱۲۳۴۵۶۷۸۹۰ as letter

[Ivan Shmakov]

>>>>> Eli Zaretskii <eliz@gnu.org> writes:

[…]

 > Also, does someone see any potential problem to make [:digit:] be a
 > superset of the current ASCII-only set, to match UTS #18 as well?
 > The comment in regex.c says it is "only used for single-byte
 > characters", but it isn't clear to me whether this is a requirement,
 > i. e. there's some code in Emacs that relies on that, or just a
 > statement of facts.

        Just for a random data point, my own preference was to always
        use [0-9] when the intent is to discern a number for a later use
        of number-to-string, etc.  Frankly, I can’t even readily suggest
        any reasonable examples where one’d want to use [:digit:] in the
        first place.

[…]

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