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Spam blocking using expression filter on "?" marks

I want to stop spam e-mails that contain serveral questionmarks (?). In this case the e-mails I receive contain six question marks in a row. I try to add an expression to the expression filter, but this doesn't work. 

I think this is because a question mark is a wildcard instead of a string. Can somebody help. Is it possible to add a string with shows like this "???" or something?  


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