Verify IP address format and port number JS code

/*
Purpose: Verify the format of IP address
Input: Strip:ip Address
Returns: False if return true through validation;
*/
Java code

1. function f_check_ip (obj)
2. {
3. Var re=/^ (d+). (d+). (d+). (d+) $/; Regular expressions that match an IP address
4. if (Re.test (Obj.value))
5. {
6. If (regexp.$1 <256 && regexp.$2<256 && regexp.$3<256 && regexp.$4<256) Retu RN true;
7.}
8. F_alert (obj, "Please enter a legitimate computer IP address");
9. return false;
10.}
11.

function F_check_ip (obj)
{
var re=/^ (d+). (d+). (d+). (d+) $/; Regular expressions that match an IP address
if (Re.test (Obj.value))
{
if (regexp.$1 <256 && regexp.$2<256 && regexp.$3<256 && regexp.$4<256) return true;
}
F_alert (obj, "Please enter a legitimate computer IP address");
return false;
}

/*
Purpose: Check if the value of the input object conforms to the port number format
Input: str input string
Return: False if return true through validation
*/
Java code

   1. Function F_check_port (obj)  
   2. { 
   3.     if (!f_check_number (obj))  
   4.  & nbsp;      return false; 
   5.     if (obj.value < 65536)  
   6.         return true; 
 & nbsp 7.     F_alert (obj, "Enter the valid computer IP address port number"); 
   8.     Return false;  
   9.}  
  10.   

Function F_check_port (obj)
{
    if (!f_check_number (obj)
         return false;
    if (Obj.value < 65536)
        return true;
    F_alert (obj, "Please enter a legitimate computer IP address port number");
    return false;
}