title: How to extract value after a particular string in scala (spark)?
body: <p>I hava a dataframe with Column :</p>
  
  <p>df =</p>
  
  <pre><code>itemType                   count
  it_shampoo                  5
  it_books                    5
  it_mm                       5
  {it_mm}                     5
  it_books it_books           5
  {=it_books} it_books        5
  </code></pre>
  
  <p>I need to get :</p>
  
  <pre><code>itemType                   count
  it_shampoo                  5
  it_books                    5
  it_mm                       5
  it_mm                       5
  it_books                    5
  it_books                    5
  </code></pre>
  
  <p>How do I extract replaces the  <code>it_books it_books</code>, <code>{=it_books} it_books</code> to <code>it_books</code>. Item Type will always follow <code>it_</code> </p>