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Source Regular Expression (^([A-Za-z])([-_.\dA-Za-z]{1,10})([\dA-Za-z]{1}))(@)(([0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3})|(([\dA-Za-z{1}][-_.\dA-Za-z]{1,25})\.([A-Za-z]{2,4}))$)
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