title: How is regex filter applied to date (isodate) type field in mongodb
body: <p>I was trying to apply a regex filter(year) to a date type field but the query returned no results. So was trying to understand the behavior of this query?</p>
  
  <pre><code>db.collection.find({"ReportedDate":/2016/i})
  </code></pre>
  
  <p><strong>Note:</strong> I can filter it by date type without regex. But I am just trying to understand the behavior of the regex filter against date type field?</p>