HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Password rule</title>
</head>
<body>
  <h1>No "password" substring</h1>
  <pre id="out"></pre>
  <script>
    var rule = /^(?!.*password).{8,}$/i;
    var samples = ["MySecret1!", "short", "myPassword123"];
    document.getElementById("out").textContent = samples.map(function (s) {
      return s + " → " + rule.test(s);
    }).join("\n");
  </script>
</body>
</html>

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JavaScript RegExp (?!...) — password rule (Try It)