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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>RegExp compile()</title>
</head>
<body>
  <h1>Basic compile()</h1>
  <pre id="out"></pre>
  <script>
    var regex = /cat/;
    if (typeof regex.compile === "function") {
      regex.compile("dog");
      document.getElementById("out").textContent =
        regex.source + "\n" + regex.test("I have a dog");
    } else {
      document.getElementById("out").textContent = "compile() not available";
    }
  </script>
</body>
</html>

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JavaScript RegExp compile() — basic (Try It)