title: how to extract string before and after comma in R
body: <p>So I have a list of string like this:</p>
  
  <pre><code>Woman Killed in Uber Accident in Goleta, California
  
  Sacramento, California Man Dies in Lyft Accident
  </code></pre>
  
  <p>And I wanna the output to be like "Goleta, California". How do I do it? 
  Thanks</p>