title: Regex for find All ip address except IP address starts with 172
body: <p>I want regex to find IP address which not starts with 172.0.0.0.</p>
  
  <p>I have written some regex <code>^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$</code> which finds all ip address.</p>