title: Ruby- split last three fields
body: <p>I know split is a useful tool and I know there is a way to do this.  I tried a few different methods but couldn't figure it out via google. Can anyone help me.</p>
  
  <pre><code>example1 = "test1,test2,test3,test4,test5"
  example2 = "test1,test2,test3,test4,test5,test6,test7"
  </code></pre>
  
  <p>So I need the result to look like this</p>
  
  <pre><code>example1 = test3,test4,test5
  example2 = test5,test6,test7
  </code></pre>
  
  <p>I would like to keep the comma's too.</p>