title: Replace all cells with specific combinations of words
body: <p>Have a df of 29000 rows and 189 columns. In some rows I have </p>
  
  <pre><code>    "true / Bob"
  </code></pre>
  
  <p>I want to find a way in which I can replace all these cells into </p>
  
  <pre><code>    "Bob"
  </code></pre>
  
  <p>Looking for a solution in which I don't just say replace "true / Bob" for "Bob". Tried to work with </p>
  
  <pre><code>gsub
  lapply
  </code></pre>