title: Python replace using regex
body: <p>Does anyone know how to replace all ocurences of '&lt;\d+' regex with '\r\n&lt;\d+', for example</p>
  
  <pre><code>"&lt;20"
  </code></pre>
  
  <p>should be transformed to</p>
  
  <pre><code>"\r\n&lt;20"
  </code></pre>
  
  <p>but </p>
  
  <pre><code>"&gt; HELLO &lt; asassdsa"
  </code></pre>
  
  <p>shuld be untouched</p>