For a string 'stuff_here_then_12' your version captures the 1. It depends if that's what the user wants. Of course there's probably a better way to do this /(\d)\d*$/ comes to mind (and /(\d)+$/ if the user wants the last digit, or even better /(\d)$/ .. updated .. well, if just the last digit is desired and it's always known to be a digit substr could be used more effeciently -- of course, you have to be sure of your data)
I was under the impressino that he wanted the entire 12 returned.
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