title: Python find and return a string inside a string
body: <p>Hello I have some string look like that: </p>
  
  <pre><code>"Alex_Hon::Chapman_x_voble_DOE2_SUB_mikaj"
  </code></pre>
  
  <p>I need to find a way to return the SUB string. 
  The problem is that before that the DOE2 is changing all the time and can be also DOE23 or DOE 4546...
  How Can I do that with python? 
  Thanks</p>