title: Pandas find columns with wildcard names
body: <p>I  have a pandas dataframe  with column names like this:</p>
  
  <pre><code>id ColNameOrig_x ColNameOrig_y
  </code></pre>
  
  <p>There are many such columns, the 'x' and 'y' came about because 2 datasets with similar column names were merged.
  What I need to do:</p>
  
  <pre><code>df.ColName = df.ColNameOrig_x + df.ColNameOrig_y
  </code></pre>
  
  <p>I am now manually repeating this line for many cols(close to 50), is there a wildcard way of doing this?</p>