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<!DOCTYPE html>
<html>
<body>
​
<h1>The input pattern attribute</h1>
​
<form action="https://www.w3schools.com/action_page.php">
  <label for="country_code">Country code:</label>
  <input type="text" id="country_code" name="country_code" pattern="[A-Za-z]{3}" title="Three letter country code"><br><br>
  <input type="submit">
</form>
​
<p><strong>Note:</strong> The pattern attribute of the input tag is not supported in Safari 10 (or earlier).</p>
​
</body>
​
</html>
​
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