title: Find Documents not having String "stag" in Mongodb
body: <p>I'm working with MongoDB, my documents have an image name. Some of my documents have string concat with image name e.g</p>
  <p><strong>Image document without &quot;stag&quot; string concat with image name</strong></p>
  <pre><code>{
      &quot;_id&quot; : ObjectId(&quot;5e0be79bc6f0fc699030b472&quot;),
      &quot;isPublished&quot; : 1,
      &quot;width&quot; : 500,
      &quot;height&quot; : 341,
      &quot;shared_by&quot; : [],
      &quot;saved_by&quot; : [ 
          &quot;5e0e01fcc6f0fc112953c05c&quot;, 
          &quot;5e10091fc6f0fc19552773be&quot;, 
          &quot;5e133a3ec6f0fc4e6b0cd5b4&quot;
      ],
      &quot;img&quot; : &quot;1577838487.png&quot;,
      &quot;deploy_date&quot; : ISODate(&quot;2020-01-01T12:00:00.000Z&quot;),
      &quot;updated_at&quot; : ISODate(&quot;2020-01-01T00:28:11.000Z&quot;),
      &quot;created_at&quot; : ISODate(&quot;2020-01-01T00:28:11.000Z&quot;)
  }
  </code></pre>
  <p><strong>Image document with &quot;stag&quot; string concat with image name</strong></p>
  <pre><code>{
      &quot;_id&quot; : ObjectId(&quot;5e0be79bc6f0fc699030b472&quot;),
      &quot;isPublished&quot; : 1,
      &quot;width&quot; : 500,
      &quot;height&quot; : 341,
      &quot;shared_by&quot; : [],
      &quot;saved_by&quot; : [ 
          &quot;5e0e01fcc6f0fc112953c05c&quot;, 
          &quot;5e10091fc6f0fc19552773be&quot;, 
          &quot;5e133a3ec6f0fc4e6b0cd5b4&quot;
      ],
      &quot;img&quot; : &quot;stag/1577838487.png&quot;,
      &quot;deploy_date&quot; : ISODate(&quot;2020-01-01T12:00:00.000Z&quot;),
      &quot;updated_at&quot; : ISODate(&quot;2020-01-01T00:28:11.000Z&quot;),
      &quot;created_at&quot; : ISODate(&quot;2020-01-01T00:28:11.000Z&quot;)
  }
  </code></pre>
  <p>I want to get all documents in which img field doesn't contain a &quot;stag&quot; string.</p>
  <p>How can I do this in MongoDB without aggregation?</p>