Validating Form Inputs with Patter Attribute
<form action="/action_page.php">
<label for="pwd">Password:</label>
<input type="password" id="pwd" name="pwd"
pattern="(?=.*\d)(?=.*[a-z])(?=.*[A-Z]).{8,}"
title="Must contain at least one number and one uppercase and lowercase letter, and at least 8 or more characters">
<input type="submit">
</form>