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how do I make whitespace optional in a regular expression?

807589Dec 29 2008 — edited Dec 30 2008
I want to match "this is a test" regardless of how many spaces (or tabs and newlines) it has between all the words. I am not sure if I am doing it right though..This is what I have 
this (\s*)?is (\s*)?a (\s*)?test
Thanks!
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Locked on Jan 27 2009
Added on Dec 29 2008
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