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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>\x vs \u</title>
</head>
<body>
  <h1>Hex vs Unicode escape</h1>
  <pre id="out"></pre>
  <script>
    var ch = "A";
    document.getElementById("out").textContent =
      /\x41/.test(ch) + "\n" +
      /\u0041/.test(ch) + "\n" +
      /^A$/.test(ch);
  </script>
</body>
</html>

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JavaScript RegExp \xHH — compare \x41 and \u0041 (Try It)