note 112579 added to function.preg-match

The most accurate IPv4 function. It will not allow leading zeros and supports the full address range of 0.0.0.0 - 255.255.255.255 <?php function is_ipv4($string) { // The regular expression checks for any number between 0 and 255 beginning with a dot (repeated 3 times) // followed by another number between 0 and 255 at the end. The equivalent to an IPv4 address. return (bool) preg_match('/^(?:(?:25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9][0-9]|[0-9])'. '\.){3}(?:25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9][0-9]?|[0-9])$/', $string); } ?> ---- Server IP: 69.147.83.199 Probable Submitter: 68.47.110.71 ---- Manual Page -- http://php.net/manual/en/function.preg-match.php Edit -- https://master.php.net/note/edit/112579 Del: integrated -- https://master.php.net/note/delete/112579/integrated Del: useless -- https://master.php.net/note/delete/112579/useless Del: bad code -- https://master.php.net/note/delete/112579/bad+code Del: spam -- https://master.php.net/note/delete/112579/spam Del: non-english -- https://master.php.net/note/delete/112579/non-english Del: in docs -- https://master.php.net/note/delete/112579/in+docs Del: other reasons-- https://master.php.net/note/delete/112579 Reject -- https://master.php.net/note/reject/112579 Search -- https://master.php.net/manage/user-notes.php