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well, I'm gonna assume this is a regular expression of some sort... in general [] surround a list so [0-9] is the list of the digits 0 though 9... ()'s are just precidence markers ^ before a list means everything BUT those things some of those are just literal characters. so [0-9]-[0-3] may mean a digit from 0 to 9, a dash, and a digit from 0 to 3. hope that helps a bit... I don't do a whole lot of regular expressions...
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