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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>RegExp constructor</title>
</head>
<body>
  <h1>Read constructor</h1>
  <pre id="out"></pre>
  <script>
    var regex = /hello/i;
    document.getElementById("out").textContent =
      String(regex.constructor) + "\n" +
      (regex.constructor === RegExp);
  </script>
</body>
</html>

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JavaScript RegExp constructor — read property (Try It)