title: Find records where field ends with other field
body: <p>I have <code>title</code>, <code>director</code> and <code>englishTitle</code> fields.</p>
  
  <pre><code>{
    title: "Iron Man",
    director: "Someone Important",
    englishTitle: "Iron Man Someone Important"
  }
  </code></pre>
  
  <p>I need to find all the records that have <code>englishTitle</code> ending with <code>director</code>'s value.</p>
  
  <p>How can I perform such query with MongoDB?</p>