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<!DOCTYPE html>
<html>
<body>
​
<form action="https://www.w3schools.com/action_page.php">
  Zip code: <input type="text" id="myText" name="zip_code">
  <input type="submit">
</form>
​
<p>Click the "Try it" button to specify a regular expression that the text field's value will be checked against. Note that we also set the "title" to describe the pattern.</p>
​
<button onclick="myFunction()">Try it</button>
​
<p id="demo"></p>
​
<script>
function myFunction() {
  document.getElementById("myText").pattern = "[1-3]";
  document.getElementById("myText").title = "A number from 1 to 3";
  document.getElementById("demo").innerHTML = "The text field can now only contain numbers from 1 to 3.";
}
</script>
​
</body>
​
<!-- Mirrored from www.w3schools.com/jsref/tryit.asp?filename=tryjsref_text_pattern2 by HTTrack Website Copier/3.x [XR&CO'2014], Mon, 27 Jan 2020 03:17:20 GMT -->
</html>
​
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