title: regex to match a maximum of 4 spaces
body: <p>I have a regular expression to match a persons name.</p>
  
  <p>So far I have ^([a-zA-Z\'\s]+)$ but id like to add a check to allow for a maximum of 4 spaces. How do I amend it to do this?</p>
  
  <p><strong>Edit:</strong> what i meant was 4 spaces anywhere in the string</p>