title: What are best practices for validating email addresses on iOS 2.0
body: <p>What is the cleanest way to validate an email address that a user enters on iOS 2.0?</p>
  
  <p><strong>NOTE</strong>: This is a historical question that is specific to iOS 2.0 and due to its age and how many other questions are linked to it it cannot be retired and MUST NOT be changed to a "modern" question.</p>