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External Data Source

Source

Regular Expression
^(?:[a-z0-9][\w\-]*[a-z0-9]*\.)*(?:(?:(?:[a-z0-9][\w\-]*[a-z0-9]*)(?:\.[a-z0-9]+)?)|(?:(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)))$