title: Django - how to use filter to check if a string field contains a word?
body: <p>my model order has a text field as: order.remark.</p>
  <p>how to filter orders with the remark field containing certain word? e.g. a reference number, a telephone number.</p>
  <p>in the order remark field the user can input anything, how to filter orders with remark containing the words &quot;SZFPS/LCB-D2232&quot;, for instance. Please be noted that user might type in a lot of information without enter space, i.e. the words are not seperated by space or tab or any sort of delimeters. how to effectively filter the orders?
  <a href="https://i.stack.imgur.com/rriS6.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/rriS6.png" alt="enter image description here" /></a></p>