title: Remove everything in string up to last forward slash
body: <p>I have a string like this: </p>
  
  <pre><code>"vehicles/vehicle_type/filename.csv"
  </code></pre>
  
  <p>I just want to be left with: </p>
  
  <pre><code>"filename.csv"
  </code></pre>
  
  <p>I have tried this: </p>
  
  <pre><code>sub('/^(.*[\\\/])/', "", the_string)
  </code></pre>
  
  <p>But get an "unrecognized escape in character string" error </p>