title: Validation Rule: Initial(s) of customer
body: <p>I’m looking for some help with creating a validation rule.
  Is is for a custom field on the Contact page called Initial.
  Here I would like to display the initial(s) of a contact in the follow way:</p>
  <p>J.S.K.</p>
  <p>The initials are only the fist name and middle names.<br />
  So only capital letters and dots between the letters. We assumed that the max amount of initials should be 7.</p>
  <p>Does anybody know how to create this is Salesforce Lightning?</p>