<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>
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