title: Regex solution for Objective-C
body: <p>What is the best method for using <strong>Regular Expressions</strong> within Objective-C?</p>
  
  <p>There seems to be some open source project that provide <strong>regex</strong> support, can any one recommend one?</p>
  
  <p>Also I looked at <code>NSPredicate</code>, can anyone suggest any <strong>regex</strong> examples? </p>
  
  <p>Background: I want use regex mainly for validation, IP's, email addresses, internal ID's etc</p>