title: Regular expression to reject all non-English characters except some characters with accents
body: <p>This works great to disallow all non-English letters:</p>
  
  <pre><code>/[^\x00-\x7F]+/
  </code></pre>
  
  <p>But I <em>would</em> like to allow these characters:</p>
  
  <pre><code>âäèéêëîïôœùûüÿçÀÂÄÈÉÊËÎÏÔŒÙÛÜŸÇ
  </code></pre>
  
  <p>How do I add those to the regex so that they are allowed?</p>