This php function Validate an IP Address using PHP and Regular Expressions, returns 1 if the IP is valid or 0 if is invalid. The regular expression rather ugly, but still functional and can be very useful. Enjoy it!
function valid_ip($ip) { return preg_match("/^([1-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])" . "(\.([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])){3}$/", $ip); }
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