title: How to find an object by part of a string?
body: <p>I have objects like this inside an array:</p>
  
  <pre><code>{
    "objectId": "566013c860b202595a4b6fd9",
    "createdAt": "2015-12-03T10:04:56.367Z",
  },
  </code></pre>
  
  <p>I'm using Underscore's <code>_.where</code> to find them based on <code>createAt</code>:</p>
  
  <pre><code>var adminsThisMonth = _.where(admins, {createdAt: adminCreatedAt})
  </code></pre>
  
  <p>Is there any way to find an object only based on one section of <code>createdAt</code>, say, the two digits between the hyphens? (<code>12</code> in this case).</p>