PHP IPV6 Regular Expression validation code _php tutorial

Copy CodeThe code is as follows:
Literally from the ABNF in rfc3986 (thanks to ' WCP ')
function ValidateIPv6 ($IP)
{
Return Preg_match ('/\a
(?:
(?:
(?: [a-f0-9]{1,4}:) {6}

::(?: [a-f0-9]{1,4}:) {5}

(?: [a-f0-9]{1,4})?::(?: [a-f0-9]{1,4}:) {4}

(?:(?: [a-f0-9]{1,4}:) {0,1}[a-f0-9]{1,4})?::(?: [a-f0-9]{1,4}:) {3}

(?:(?: [a-f0-9]{1,4}:) {0,2}[a-f0-9]{1,4})?::(?: [a-f0-9]{1,4}:) {2}

(?:(?: [a-f0-9]{1,4}:) {0,3}[a-f0-9]{1,4})?:: [a-f0-9]{1,4}:

(?:(?: [a-f0-9]{1,4}:) {0,4}[a-f0-9]{1,4})?::
)
(?:
[A-f0-9] {1,4}:[a-f0-9]{1,4}

(?:(?: [0-9]| [1-9] [0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5]) \.) {3}
(?: [0-9]| [1-9] [0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])
)

(?:
(?:(?: [a-f0-9]{1,4}:) {0,5}[a-f0-9]{1,4})?:: [a-f0-9]{1,4}

(?:(?: [a-f0-9]{1,4}:) {0,6}[a-f0-9]{1,4})?::
)
) \z/ix ',
$IP
);
}
?>

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