title: grep all characters including newline
body: <p>I'm parsing an XML file with </p>
  
  <pre><code>"lalala it's a Sunday {{ Some words here, maybe
  a new line }} oh boy"
  </code></pre>
  
  <p>How would I use grep to get everything within  "{{" and "}}" given that the grep <code>.</code> character doesn't recognize newlines?</p>
  
  <p>Currently I have</p>
  
  <pre><code>grep '{{.*}}'
  </code></pre>
  
  <p>but it only works on things that are on the same line.</p>