title: Substring to nth character
body: <p>I need to substring to the 2nd comma in an NSString.</p>
  
  <p>Input:</p>
  
  <pre><code>NSString *input = @"title, price, Camry, $19798, active";
  </code></pre>
  
  <p>Desired Output:</p>
  
  <pre><code>NSString *output = @"title, price";
  </code></pre>
  
  <p>Thanks!</p>
  
  <p>UPDATE:</p>
  
  <p>I have the following but the problem is it needs to skip the last comma:</p>
  
  <pre><code>NSString *output = [input rangeOfString:@"," options:NSBackwardsSearch];
  </code></pre>