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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>1-3 octal digits</title>
</head>
<body>
  <h1>Octal digit counts</h1>
  <pre id="out"></pre>
  <script>
    document.getElementById("out").textContent =
      "\65 (octal) = char code " + parseInt("65", 8) + "\n" +
      /\65/.test("5") + "\n" +
      "\101 = " + parseInt("101", 8) + " = A: " + /\101/.test("A") + "\n" +
      "\011 = tab: " + /\011/.test("a\tb");
  </script>
</body>
</html>

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JavaScript RegExp \ooo — one and two digit forms (Try It)