title: How to use regex in html5 attribute for Cyrillic letters?
body: <p>First I've searched for the answer but with no success till now.</p>
  
  <p>I have an form that submits some inputs via POST but before that I want to secure on client side that for the First Name and Last Name are used only Latin or Cyrillic letters.</p>
  
  <p>So far it works only for the Latin letters but I cant get it work with Cyrillic letters.
  This is what I use now, any help would be appreciated</p>
  
  <pre><code>&lt;input id="userfnamesignup" type="text" pattern="[a-zA-Z]{3-30}" 
         name="user_fname" placeholder="Enter your name please" required /&gt;
  </code></pre>