Ilya Zakharevich writes:
Maybe the most notable idea is *substraction* of categories (these
used to be called character classes). The syntax is neat, too, but I
have doubts about backward compatibility. Basically, '^' toggles the
"polarity" of a category: [A^B^C] = category A - category B + category C.
Here they also talk about "word characters" and equivalence classes ([=c=]
in POSIX), and about collation characters ([.c.] in POSIX).
I proposed something like [[: alphanum & ^lower :]] some time ago (I
hope you allow for whitespace in POSIXish syntax? ;-).
Ummm, not right now :-)
Character class [: alphanum & ^lower :] unknown at -e line 1.
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