title: How can i regex validate a user submitted password which is encoded in PBKDF2
body: <p>I am trying to validate the password strength for a user when an admin creates a new  profile. </p>
  
  <p>When the form gets submitted to the backend, i get the password encrypted in PBKDF2.
  I have to validate it in java, i cannot validate it in zul framework script(My FrontEnd script).</p>
  
  <p>Can someone help me how to <strong>decrypt PBKDF2</strong> and validate the password strength with regex.</p>