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Source Regular Expression (?<email>[a-zA-Z][a-zA-Z0-9-_.]+\@[a-zA-Z][a-zA-Z0-9-_]+\.(?(?=[a-zA-Z]{2}\.)([a-zA-Z0-9-_]{2}\.[a-zA-Z0-9-_]{2})|([a-zA-Z0-9-_]{2,3})))
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