title: Python: Regular Expression to filter string
body: <p>I am having an input string:</p>
  
  <pre><code>internal_key="apachesolr" pid="2822" category="known" display_name="Apache Solr" vendor="The Apache Software Foundation"
  </code></pre>
  
  <p>I have to filter the display_name, and that name can be anything.</p>
  
  <p>the output should be:</p>
  
  <p>Apache Solr</p>