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The problem is with the question mark. It has a special function in regular expressions to mean 0 or 1 instance(s) of the character preceding it. My first attempt would be to place a backslash in front of it as in "\?" and if that didn't work, try doubling the question mark "??" which I think would mean 0 or 1 instances of the preceding question mark. That may also be more correct to use "(?)?" to make it work. And if that didn't work I would go read up on regex (short for REgular EXpressions) in htaccess.
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