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External Data Source

Source

Regular Expression
(?<user>(?:(?:[^ \t\(\)\<\>@,;\:\\\"\.\[\]\r\n]+)|(?:\"(?:(?:[^\"\\\r\n])|(?:\\.))*\"))(?:\.(?:(?:[^ \t\(\)\<\>@,;\:\\\"\.\[\]\r\n]+)|(?:\"(?:(?:[^\"\\\r\n])|(?:\\.))*\")))*)@(?<domain>(?:(?:[^ \t\(\)\<\>@,;\:\\\"\.\[\]\r\n]+)|(?:\[(?:(?:[^\[\]\\\r\n])|(?:\\.))*\]))(?:\.(?:(?:[^ \t\(\)\<\>@,;\:\\\"\.\[\]\r\n]+)|(?:\[(?:(?:[^\[\]\\\r\n])|(?:\\.))*\])))*)