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IPv6 address string, controlled by a regular expression.
Address is to be specified in colon separated hexadecimal notation as described in RFC 4291 section 2.2 items 1-3, but without leading 0s.
IPv6 addresses length: 3-39 characters.
Valid characters: 0123456789abcdefABCDEF:
Regex:
(^\s*(((([1-9A-Fa-f][0-9A-Fa-f]{0,3}|0):){7}(([1-9A-Fa-f][0-9A-Fa-f]{0,3}|0)|:))|
((([1-9A-Fa-f][0-9A-Fa-f]{0,3}|0):){6}(:([1-9A-Fa-f][0-9A-Fa-f]{0,3}|0)|((25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])(\.(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])){3})|:))|
((([1-9A-Fa-f][0-9A-Fa-f]{0,3}|0):){5}(((:([1-9A-Fa-f][0-9A-Fa-f]{0,3}|0)){1,2})|:((25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])(\.(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])){3})|:))|
((([1-9A-Fa-f][0-9A-Fa-f]{0,3}|0):){4}(((:([1-9A-Fa-f][0-9A-Fa-f]{0,3}|0)){1,3})|((:([1-9A-Fa-f][0-9A-Fa-f]{0,3}|0))?:((25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])(\.(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])){3}))|:))|
((([1-9A-Fa-f][0-9A-Fa-f]{0,3}|0):){3}(((:([1-9A-Fa-f][0-9A-Fa-f]{0,3}|0)){1,4})|((:([1-9A-Fa-f][0-9A-Fa-f]{0,3}|0)){0,2}:((25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])(\.(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])){3}))|:))|
((([1-9A-Fa-f][0-9A-Fa-f]{0,3}|0):){2}(((:([1-9A-Fa-f][0-9A-Fa-f]{0,3}|0)){1,5})|((:([1-9A-Fa-f][0-9A-Fa-f]{0,3}|0)){0,3}:((25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])(\.(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])){3}))|:))|
((([1-9A-Fa-f][0-9A-Fa-f]{0,3}|0):){1}(((:([1-9A-Fa-f][0-9A-Fa-f]{0,3}|0)){1,6})|((:([1-9A-Fa-f][0-9A-Fa-f]{0,3}|0)){0,4}:((25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])(\.(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])){3}))|:))|
(:(((:([1-9A-Fa-f][0-9A-Fa-f]{0,3}|0)){1,7})|((:([1-9A-Fa-f][0-9A-Fa-f]{0,3}|0)){0,5}:((25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])(\.(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])){3}))|:)))(%.+)?\s*$)
Examples: FF01::101, 2001:DB8:0:0:8:800:200C:417A
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