[Python] Using set operators with python regex module

I'm having trouble getting set operators to work in the regex module (regex 2013-11-29) in python-3.x. For example, to match ASCII characters minus punctuation I have tried:

import regex as rx

data = '(foo)'
for m in rx.finditer(r'[\p{ASCII}--\p{P}]+',data):
print(m.group(0)) # expect 'foo', getting '(foo)'


The documentation gives this example:

[\p{N}--[0-9]] # Set containing all numbers except '0' .. '9'

Am I missing something here?

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