preg_match for a variable, please help

[tough_time]

Hi Guys

 

First time post.

 

I am struggling with an IF statement, the check should check the host variable which should accept IP address 1.2.3.4 format and also alpha numeric format as well i.e SERVER1,

 

if (!preg_match("^[a-zA-Z-/\'/]^", $host) || preg_match("/^([a-zA-Z0-9-]+[\.])+([a-zA-Z0-9]+)$/", $host)){

 

 

Thanks