It should be worth noting that there was prior to this JDK release a gnu.regex class that is pretty close to perl compatibility (it lacks inline functions and \G support), though full compatibility is a end-goal of it. There's also gnu.rex which is slightly less full-featured to achieve a smaller footprint.

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Dr. Michael K. Neylon - mneylon-pm@masemware.com || "You've left the lens cap of your mind on again, Pinky" - The Brain
It's not what you know, but knowing how to find it if you don't know that's important