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> In my ideal world the syntax would evolve so you could constrain the
categories -- "\p{Pd except '-'}", "any character that is some kind of
dash except for U+002D "hyphen-minus", for example -- since that would
make this even more useful for functions that take regular expressions
such as tokenize().
XPath regular expressions allow a subtraction operator within a character class: [\p{Lu}-[IO]] allows any upper case letter except I or O. Michael Kay Saxonica
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