title: How to handle TextField validation in password in Flutter
body: <p>I created a login page and I need to add these things to my password. How do I do it <strong>with validation alert message?</strong></p>
  
  <ul>
  <li>Minimum 1 Upper case</li>
  <li>Minimum 1 lowercase</li>
  <li>Minimum 1 Numeric Number</li>
  <li>Minimum 1 Special Character</li>
  <li>Common Allow Character ( ! @ # $ &amp; * ~ )</li>
  </ul>