title: How to get the columns index from datatable which column name contains like 'ColumnName'
body: <p>I have a datatable which contains columns created dynamically:</p>
  
  <pre><code>Name | Role | Comm w1 | Role | Comm w2 | .... | Total Comm |
  </code></pre>
  
  <p>I want to get all columns index which contains <code>Comm</code>. </p>
  
  <p>The expected result should be:</p>
  
  <pre><code>2
  4
  ...
  </code></pre>