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External Data Source

Source

Regular Expression
(^\d{20}$)|(^((:[a-fA-F0-9]{1,4}){6}|::)ffff:(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[0-9]{1,2})(\.(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[0-9]{1,2})){3}$)|(^((:[a-fA-F0-9]{1,4}){6}|::)ffff(:[a-fA-F0-9]{1,4}){2}$)|(^([a-fA-F0-9]{1,4}) (:[a-fA-F0-9]{1,4}){7}$)|(^:(:[a-fA-F0-9]{1,4}(::)?){1,6}$)|(^((::)?[a-fA-F0-9]{1,4}:){1,6}:$)|(^::$)