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But then you have to get Apache :P I prefer to start with just the standard Java API. Besides, learning regular expressions is a good idea anyways.

I'd recommend looking through the Sun Regex Tutorials, or any other tutorials dealing with regular expressions to understand how they work. Here's a regex I've used that picks up pretty much every...

Can these numbers be decimal numbers? Or are they guaranteed to be integers? If they are integers, you can just use the Character.isDigit methods. Otherwise, it's easiest to use the Regex class and...