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External Data Source

Source

Regular Expression
^(?i:(?<local_part>[a-z0-9!#$%^&*{}'`+=-_|/?]+(?:\.[a-z0-9!#$%^&*{}'`+=-_|/?]+)*)@(?<labels>[a-z0-9]+\z?.*[a-z0-9-_]+)*(?<tld>\.[a-z0-9]{2,}))$