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External Data Source

Source

Regular Expression
(?<username>#?[+_a-zA-Z0-9+-]+(\.[+_a-zA-Z0-9+-]+)*)@(?<domain>[a-zA-Z0-9]+(-(?!-)|[a-zA-Z0-9\.])*?[a-zA-Z0-9]+\.([0-9]{1,3}|[a-zA-Z]{2,3}|(aero|arpa|asia|coop|info|jobs|mobi|museum|name|travel)))