title: Using a wildcard on S3 Event Notification prefix
body: <p>I have a Lambda function that creates a thumbnail image for every image that gets uploaded to my bucket, it then places the Thumbnail inside another bucket.  When I upload a user image (profile pic) I use the users <strong>ID</strong> and <strong>name</strong> as part of the key:</p>
  
  <p><code>System-images/users/250/john_doe.jpg</code></p>
  
  <p>Is there a way to use a wildcard in the <code>prefix</code> path?  This is what I have so far but it doesn't work</p>
  
  <p><a href="https://i.stack.imgur.com/yEGgA.png" rel="noreferrer"><img src="https://i.stack.imgur.com/yEGgA.png" alt="S3 bucket properties"></a></p>