in reply to Re: negating POSIX regexp classes doesn't work as expected
in thread negating POSIX regexp classes doesn't work as expected

Wrong two ways. The caret should be after the colon (Update: or just inside the outer brackets, in which case it's normal charset negation and not a POSIX extension), and the brackets need to be doubled. Did you test this? Did you try it with and without nondigits in the string?
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