title: Regex words with accents
body: <p>I have this regex</p>
  
  <pre><code>\b(t[úu]s*)\b
  </code></pre>
  
  <p>And i have this words:</p>
  
  <pre>
  tu (works)
  tú (doesn't work)
  tus (works)
  tús (works)
  </pre>
  
  <p>Why can't I match <code>tú</code>?</p>