? My colleague tested it on Stata and it does. 🙄
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@sascha_wolfer I think this may depend on regex engine, but I thought the range operator translated to ASCII representation so the range would make sense.
@psanker @sascha_wolfer Maybe there are implementations that do this (Perl ensures consistent behavior for the special ranges A-Z, a-z, 0-9, and any subranges of these), but according to POSIX, in any locale other than POSIX, “a range expression has unspecified behavior.” Better use [[:upper:]] or something equivalent.
