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External Data Source

Source

Regular Expression
^<(?:@[a-z0-9][a-z0-9-]*[a-z0-9](?:\.[a-z0-9][a-z0-9-]*[a-z0-9])+(?:,@[a-z0-9][a-z0-9-]*[a-z0-9](?:\.[a-z0-9][a-z0-9-]*[a-z0-9])+)*:)?([a-zA-Z0-9!#\$%&'\*\+\-\/=\?\^_`{\|}~]+(?:\.[a-zA-Z0-9!#\$%&'\*\+\-\/=\?\^_`{\|}~]+)*@[a-z0-9][a-z0-9-]*[a-z0-9](?:\.[a-z0-9][a-z0-9-]*[a-z0-9])+)>$