title: Add rows in a dataframe when a special character is encountered in a row
body: <p>My initial data looks like following :</p>
  <pre><code>ColA   ColB                 ColC
  Sku1   Life/Personal        NA
  Sku2   Children             NA 
  Sku3   Grooming/Hair/Makeup NA
  </code></pre>
  <p>I want for ever slash (&quot;/&quot;) in Col B, text after that should come in another row. For ex, above data should look like below :</p>
  <pre><code>ColA   ColB          ColC
  Sku1   Life          NA
  Sku1   Personal      NA
  Sku2   Children      NA
  Sku3   Grooming      NA
  Sku3   Hair          NA
  Sku3   Makeup        NA
  </code></pre>