This is not exactly a response to your question, but I just wanted to mention it anyway.
You seem to have a LOT of Regex questions, are you aware of the book "Mastering Regular Expressions"? It is a terrific book. Obviously, the monks don't mind giving assistance as can be seen by the amount of good answers you are getting; However, getting ahold of, and reading this book might really illuminate some things for.
Just passing along some extra information about how to fish....
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