title: gsub R extracting string
body: <p>I am trying to extract a string between two commas with gsub. If I have the following</p>
  
  <pre><code>xz&lt;- "1620 Honeylocust Drive, 60210 IL, USA"
  </code></pre>
  
  <p>and I want to extract everything between the two commas, (<code>60120 IL</code>), is it possible to use gsub?</p>
  
  <p>I have tried</p>
  
  <pre><code>gsub(".*,","",xz)
  </code></pre>
  
  <p>The result is USA. How can I do it?</p>