title: How to check if NSString contains a string with a specific format?
body: <p>How can I detect if a certain NSString contains a string format like this for example:</p>
  
  <p>I would like to check if a string is in a certain format. For example if I have the string format, <code>@"%d %d/%d %@"</code>, I would like my code to return YES if I compare it against <code>@"1 1/2 oz"</code>, and like wise would return NO if I compared it against <code>@"20 ml"</code>.</p>