> So the output still differs, and some of those differences may or may
> not be wanted.
I took a look at the output, and by and large I'd want the differences;
that is, I'd want the UCP version, which generates less output. This is
because several Emacs source files are not UTF-8, and \b has nonsense
matches when searching text files encoded via Shift-JIS or Big 5 or
whatever. For this sort of thing, the fewer matches the better.
> If all you're doing is matching either ASCII or Japanese text and you
> want "locale-aware numbers" it might do the wrong thing.
I'm not seeing much of a problem here. When searching Japanese text, I
would expect \d and [0-9０-９] (using both ASCII and full-width digits) to
be equivalent so (assuming UCP) it's not a big deal as to which regex
you use, since Japanese text won't contain Bengali (or whatever) digits.
And when searching binary data, I'd expect a bunch of garbage no matter
how \d is interpreted.
Here I'm assuming [０-９] (using full-width digits) has the expected
meaning in PCRE2, i.e., that PCRE2 didn't make the same mistake that
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