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Daniel Hartin18,106 Points
the docs for the split method are here http://docs.oracle.com/javase/7/docs/api/java/lang/String.html#split(java.lang.String)
you will see the method returns a string array so firstly you should define your return type as String, in your method you then need to call .split() on the mBody string. You will see from the docs their is a method which takes a regex expression as a parameter, you should use this method placing the regular expression shown in the question text inside double quotes.
I hope this was enough of a hint without just giving you the answer, if you're still struggling let mek know and I can produce shows examples to explain better.