A trip to regexlib.com revealed this little gem :
^([a-zA-Z0-9_\-\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([a-zA-Z0-9\-]+\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$
(mind the line wrap).
Here is the link to the above expression :
http://regexlib.com/REDetails.aspx?regexp_id=26
Regards,
Burhan Khalid
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