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<html><body><h1>The input pattern attribute</h1><p>A form with a password field that must contain 8 or more characters that are of at least one number, and one uppercase and lowercase letter:</p><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></body></html>