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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>exec() null</title>
</head>
<body>
  <h1>No match</h1>
  <pre id="out"></pre>
  <script>
    var regex = /zzz/;
    var result = regex.exec("hello world");
    document.getElementById("out").textContent =
      result === null ? "null (no match)" : result[0];
  </script>
</body>
</html>

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JavaScript RegExp exec() — no match (Try It)