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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Must contain digit</title>
</head>
<body>
  <h1>Digit + length rule</h1>
  <pre id="out"></pre>
  <script>
    var rule = /^(?=.*\d).{8,}$/;
    var samples = ["Secret1!", "Secret!!", "Sh0rt"];
    document.getElementById("out").textContent = samples.map(function (s) {
      return s + " → " + rule.test(s);
    }).join("\n");
  </script>
</body>
</html>

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JavaScript RegExp (?=...) — require digit (Try It)