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Source Regular Expression ^([a-zA-Z0-9][a-zA-Z0-9_]*(\.{0,1})?[a-zA-Z0-9\-_]+)*(\.{0,1})@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|([a-zA-Z0-9\-]+(\.([a-zA-Z]{2,10}))(\.([a-zA-Z]{2,10}))?(\.([a-zA-Z]{2,10}))?))[\s]*$
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