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<?php $ipString = 'ffff:heee:dddd:cccc:bbbb:aaaa:9999:8888'; $test = array(); preg_match_all("/(?U:[a-f0-9]+:?)+/", $ipString, $test); if(count($test) > 1 || count($test[0]) > 8){ echo false; }else{ if(implode(':', $test[0]) !== $ipString){ echo false; } } var_dump($test); var_dump($ipString); echo implode(':', $test[0]); echo true; ?>
Output for git.master, git.master_jit, rfc.property-hooks
array(1) { [0]=> array(8) { [0]=> string(4) "ffff" [1]=> string(3) "eee" [2]=> string(4) "dddd" [3]=> string(4) "cccc" [4]=> string(4) "bbbb" [5]=> string(4) "aaaa" [6]=> string(4) "9999" [7]=> string(4) "8888" } } string(39) "ffff:heee:dddd:cccc:bbbb:aaaa:9999:8888" ffff:eee:dddd:cccc:bbbb:aaaa:9999:88881

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