countUntil with negated pre-defined predicate?

[Robert M. Münch]

This works:

	countUntil!(std.uni.isWhite)("hello world"))

How can I switch this to (not working);

	countUntil!(!std.uni.isWhite)("hello world"))

without having to write my own predicate?

Or is there an even better way to search for all "drawable unicode characters"?

-- 
Robert M. Münch
http://www.saphirion.com
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