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<!DOCTYPE html>
<html>
<body>
​
<h2>The pattern Attribute</h2>
<p>The pattern attribute specifies a regular expression that the input element's value is checked against.</p>
​
<form action="https://www.w3schools.com/action_page.php">
  Country code: <input type="text" name="country_code" pattern="[A-Za-z]{3}" title="Three letter country code">
  <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, or in Safari 10 and earler versions.</p>
​
</body>
​
<!-- Mirrored from www.w3schools.com/html/tryit.asp?filename=tryhtml5_input_pattern by HTTrack Website Copier/3.x [XR&CO'2014], Mon, 27 Jan 2020 02:25:16 GMT -->
</html>
​
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