This week's giveaway is in the EJB and other Java EE Technologies forum. We're giving away four copies of EJB 3 in Action and have Debu Panda, Reza Rahman, Ryan Cuprak, and Michael Remijan on-line! See this thread for details.
Oracle's regular expressions are based on the POSIX Extended Regular Expressions (ERE). Java adds more functionality to it, but I think the basic syntax is the same. You'll find some comparative information here.