title: sed how to escape " ( and special characters escaping
body: <p>I am trying to do the following pattern replacement with sed, but it keeps telling me it cannot find the pattern. I dont know the right combination of escaping to make it work.</p>
  
  <pre><code>sed -i -e s_('DB_SOURCE', 'demo')_('DB_SOURCE', 'local')_ sedTest
  </code></pre>