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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>\101 test()</title>
</head>
<body>
  <h1>Octal \101</h1>
  <pre id="out"></pre>
  <script>
    document.getElementById("out").textContent =
      /\101/.test("A") + "\n" +
      /\101/.test("B") + "\n" +
      /\101/.test("ABC");
  </script>
</body>
</html>

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JavaScript RegExp \ooo — match A with \101 (Try It)