There is no error in the code but in the help message.
According to the spec group zero always stands for the entire _expression_.
http://docs.oracle.com/javase/1.6/docs/api/java/util/regex/Pattern.html#cg

Change By: Tomasz Zieleniewski (24/Jul/12 2:06 PM)
Status: In Progress Resolved
Fix Version/s: current
Resolution: Fixed
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