Others have answered your question. Basically you have three different types of question marks: ?:, \? and ? - non capturing matching, escaping, and zero or more matches. But looking at that regex, I wonder if it's all just overkill. It looks like your matching a flash url that may have paramaters. I wonder if this simpler regex will do the job as well:
m/\.swf.*$/oi
Comments? I know some people wish death to dot-star but what's the downside here?
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