HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Strip non-digits</title>
</head>
<body>
  <h1>Strip formatting</h1>
  <pre id="out"></pre>
  <script>
    var formatted = "(555) 123-4567";
    var plain = formatted.replace(/[^0-9]/g, "");
    var plain2 = formatted.replace(/\D/g, "");
    document.getElementById("out").textContent = plain + "\n" + plain2;
  </script>
</body>
</html>

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JavaScript RegExp [^0-9] — strip formatting (Try It)