<html>
<body>
<p>A form with a search field that CANNOT contain the following characters: ' or "</p>
<form action="https://www.w3schools.com/action_page.php">
Search: <input type="search" name="search" pattern="[^'\x22]+" title="Invalid input">
<input type="submit">
</form>
<p><strong>Note:</strong> The pattern attribute of the input tag is not supported in Internet Explorer 9 and earlier versions.</p>
</body>
<!-- Mirrored from www.w3schools.com/tags/tryit.asp?filename=tryhtml5_input_pattern5 by HTTrack Website Copier/3.x [XR&CO'2014], Mon, 27 Jan 2020 03:17:00 GMT -->
</html>