title: Unable to get values from Pandas Column
body: <p>Here is my dataset:</p>
  <pre><code>site_key                         site_det                             site_xls
  169       [{'id': 'XYTTR_23412', 'det': '49', 'person': 'Aron'}]      AMB_129
  124       [{'id': 'XYTTR_23699', 'det': '42', 'person': 'Mike'}]      AMB_239
  149       [{'id': 'XYTTR_26455', 'det': '47', 'person': 'Ross'}]      AMB_126
  </code></pre>
  <p>I want only these values in my final dataset:</p>
  <pre><code>site_key        site_det     site_xls
  169             23412        129
  124             23699        239
  149             26455        126
  </code></pre>
  <p>I tried with regex but it didn't worked... How can I get this values in my dataset</p>