title: dynamodb column search starts with query
body: <p>We are using loopback 3 and dyanmodb for our rest API. In one of the query, we want to search name which starts with letters entered by the user. For e.g.:</p>
  
  <pre><code> {
       name: { like: "^" + str}
   }, 
  </code></pre>
  
  <p>But regexp is not supported in dynamodb. How could I achieve this in dynamodb ? Is there an alternate solution ?</p>
  
  <p>Thanks</p>