title: Jquery - Split a string(credit card number) in 4 groups
body: <p>I'm looking to split a credit card number in 4 groups with 4 digits each.</p>
  
  <p>So for 4111111111111111, to be displayed as 4111 1111 1111 1111.</p>
  
  <p>Keep in mind that this code is already existing, so I don't want to split it while typing.</p>
  
  <p>Thanks a lot!</p>