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<!DOCTYPE html> <html> <body> <h1>The input pattern attribute</h1> <p>A form with a search field that CANNOT contain the following characters: ' or "</p> <form action="/action_page.php"> <label for="search">Search:</label> <input type="search" id="search" name="search" pattern="[^'\x22]+" title="Invalid input"> <input type="submit"> </form> </body> </html>
