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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>\f in \s</title>
</head>
<body>
  <h1>Form feed as whitespace</h1>
  <pre id="out"></pre>
  <script>
    var mixed = "a\f b\tc";
    document.getElementById("out").textContent =
      /\s/.test(mixed) + "\n" +
      JSON.stringify(mixed.match(/\s/g)) + "\n" +
      /\f/.test(mixed) + "\n" +
      mixed.replace(/\s/g, "-");
  </script>
</body>
</html>

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JavaScript RegExp \f — \s whitespace (Try It)