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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>[^0-9] test()</title>
</head>
<body>
  <h1>test() with [^0-9]</h1>
  <pre id="out"></pre>
  <script>
    var nonDigit = /[^0-9]/;
    document.getElementById("out").textContent =
      nonDigit.test("12345") + "\n" +
      nonDigit.test("12a45") + "\n" +
      nonDigit.test("hello");
  </script>
</body>
</html>

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