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<?php $url ="[::1]/challenges/flag.php"; if (preg_match ('/[https?|[st]?ftp|dict|gopher|scp|telnet|ldaps?]\:\/\/.*(\d+|[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3})/i', $url)) { die('Please do not access by IP.'); } elseif (preg_match ('/localhost/i', $url)) { die ('Please do not access localhost.'); }
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