title: NSString Library... Anyone know of a helper library for NSString?
body: <p>Coming from a ruby background, I'm wishing NSString had some convenient methods like the following:</p>
  
  <pre><code>[@"John" contains:@"ohn"] =&gt; BOOL
  [@"1,2,3,4," split:@","] =&gt; NSArray
  </code></pre>
  
  <p>Anyone know of such an NSString helper library?</p>