title: Mongoose.js: Find user by username LIKE value
body: <p>I like to to go find a user in mongoDb by looking for a user called value.
  The problem with:</p>
  
  <pre><code>username: 'peter'
  </code></pre>
  
  <p>is that i dont find it if the username is "Peter", or "PeTER".. or something like that.</p>
  
  <p>So i want to do like sql</p>
  
  <pre><code>SELECT * FROM users WHERE username LIKE 'peter'
  </code></pre>
  
  <p>Hope you guys get what im askin for?</p>
  
  <p><em>Short: 'field LIKE value' in mongoose.js/mongodb</em></p>