regex - PHP preg_match problem with IPv6 -


i'm matching ip addresses in php. check is:

function checkip($ip){     $ip = trim($ip);     if (preg_match("\b(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\b", $ip)) return true;     $v6pattern = "/ (\a([0-9a-f]{1,4}:){1,1}(:[0-9a-f]{1,4}){1,6}\z)| (\a([0-9a-f]{1,4}:){1,2}(:[0-9a-f]{1,4}){1,5}\z)| (\a([0-9a-f]{1,4}:){1,3}(:[0-9a-f]{1,4}){1,4}\z)| (\a([0-9a-f]{1,4}:){1,4}(:[0-9a-f]{1,4}){1,3}\z)| (\a([0-9a-f]{1,4}:){1,5}(:[0-9a-f]{1,4}){1,2}\z)| (\a([0-9a-f]{1,4}:){1,6}(:[0-9a-f]{1,4}){1,1}\z)| (\a(([0-9a-f]{1,4}:){1,7}|:):\z)| (\a:(:[0-9a-f]{1,4}){1,7}\z)| (\a((([0-9a-f]{1,4}:){6})(25[0-5]|2[0-4]\d|[0-1]?\d?\d)(\.(25[0-5]|2[0-4]\d|[0-1]?\d?\d)){3})\z)| (\a(([0-9a-f]{1,4}:){5}[0-9a-f]{1,4}:(25[0-5]|2[0-4]\d|[0-1]?\d?\d)(\.(25[0-5]|2[0-4]\d|[0-1]?\d?\d)){3})\z)| (\a([0-9a-f]{1,4}:){5}:[0-9a-f]{1,4}:(25[0-5]|2[0-4]\d|[0-1]?\d?\d)(\.(25[0-5]|2[0-4]\d|[0-1]?\d?\d)){3}\z)| (\a([0-9a-f]{1,4}:){1,1}(:[0-9a-f]{1,4}){1,4}:(25[0-5]|2[0-4]\d|[0-1]?\d?\d)(\.(25[0-5]|2[0-4]\d|[0-1]?\d?\d)){3}\z)| (\a([0-9a-f]{1,4}:){1,2}(:[0-9a-f]{1,4}){1,3}:(25[0-5]|2[0-4]\d|[0-1]?\d?\d)(\.(25[0-5]|2[0-4]\d|[0-1]?\d?\d)){3}\z)| (\a([0-9a-f]{1,4}:){1,3}(:[0-9a-f]{1,4}){1,2}:(25[0-5]|2[0-4]\d|[0-1]?\d?\d)(\.(25[0-5]|2[0-4]\d|[0-1]?\d?\d)){3}\z)| (\a([0-9a-f]{1,4}:){1,4}(:[0-9a-f]{1,4}){1,1}:(25[0-5]|2[0-4]\d|[0-1]?\d?\d)(\.(25[0-5]|2[0-4]\d|[0-1]?\d?\d)){3}\z)| (\a(([0-9a-f]{1,4}:){1,5}|:):(25[0-5]|2[0-4]\d|[0-1]?\d?\d)(\.(25[0-5]|2[0-4]\d|[0-1]?\d?\d)){3}\z)| (\a:(:[0-9a-f]{1,4}){1,5}:(25[0-5]|2[0-4]\d|[0-1]?\d?\d)(\.(25[0-5]|2[0-4]\d|[0-1]?\d?\d)){3}\z) /x";     if (preg_match($v6pattern, $ip)) return true;     return false; }

however, i'm getting error: warning: preg_match() [function.preg-match]: delimiter must not alphanumeric or backslash in c:\xampp\htdocs\index.php on line 5

line 5 if (preg_match("\b(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\b", $ip)) return true;

what's wrong?

you have place regex between delimiters. check manual. can use filters , avoid reinventing wheel. example: 

filter_var($var, filter_validate_ip, filter_flag_ipv6); //for ip's v6

and 

filter_var($var, filter_validate_ip, filter_flag_ipv4); //for ip's v4

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