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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Hex digit class</title>
</head>
<body>
  <h1>Digits 0-9 in hex</h1>
  <pre id="out"></pre>
  <script>
    var re = /[\x30-\x39]+/g;
    var text = "Room \x32\x35\x42 has code 99";
    document.getElementById("out").textContent =
      text.match(re).join(", ") + "\n" +
      "same as \\d+: " + /\d+/.test("99");
  </script>
</body>
</html>

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JavaScript RegExp \xHH — digit range (Try It)