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Regular expression. Thanks to Stephen Cole Kleene who introduced this concepts. I'm not capable enough with regex, I still working on it. Hahaha. I will post here for such common expression. * IP ^((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$ * etc. * etc.
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