title: Remove Part of an NSString and copy it into another NSString
body: <p>So I have an NSString, lets say it: <code>NSString *mainString = @"My Name is Andrew (I like computers)";</code>
  And I want remove everything from the "(" to the ")" from mainString.  And I want to put everything in between the "()" into a subString.</p>
  
  <p>For example:</p>
  
  <pre><code>NSString *mainString = @"My Name is Andrew (I like computers)";
  NSString *subString;
  
  //The code I need help with
  
  mainString = @"y Name is Andrew ";
  subString = @"I like computers";
  </code></pre>
  
  <p>I hope this makes sense.  It would really help me.  Thanks in Advance.  I've been playing with <code>NSRange</code> and <code>NSMutableStrings</code> but I'm having trouble.  Thanks in advance.</p>