input field ip validation code example

Example: ip address pattern regex javascript

function ValidateIPaddress(ipaddress) 
{
 if (/^(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]?)$/.test(myForm.emailAddr.value))
  {
    return (true)
  }
alert("You have entered an invalid IP address!")
return (false)
}