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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>new regex.constructor</title>
</head>
<body>
  <h1>Build via constructor property</h1>
  <pre id="out"></pre>
  <script>
    var template = /placeholder/;
    var clone = new template.constructor("\\w+", "g");
    document.getElementById("out").textContent =
      clone.source + " / " + clone.flags + "\n" +
      clone.test("abc123");
  </script>
</body>
</html>

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JavaScript RegExp constructor — build via property (Try It)