Regular Expressions

I am having trouble in using and decoding Strings Regular Expression.

Here is a pattern, "(?i)((^[aeiou])|(\s+[aeiou]))\w+[aeiou]\b", and is to matched to "Arline ate eight apples and one orange while Anita hadn't any". Unable to identify the result, as to how.

the question is from Thinking in Java by Bruce Eckel, Strings Chapter.

Kindly enlighten.