title: Replace column values using regex in pandas data frame
body: <p>I have a column in <code>pandas</code> data frame like below. Column name is <code>ABC</code></p>
  
  <pre><code>ABC
  Fuel
  FUEL
  Fuel_12_ab
  Fuel_1
  Lube
  Lube_1
  Lube_12_a
  cat_Lube
  </code></pre>
  
  <p>Now I want to replace the values in this column using regex like below</p>
  
  <pre><code>ABC
  Fuel
  FUEL
  Fuel
  Fuel
  Lube
  Lube
  Lube
  cat_Lube
  </code></pre>
  
  <p>How can we do this type of string matching in <code>pandas</code> data frame.</p>