HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>No digits validation</title>
</head>
<body>
  <h1>Validate no digits</h1>
  <pre id="out"></pre>
  <script>
    function hasNoDigits(name) { return !/[0-9]/.test(name); }
    var lettersOnly = /^[^0-9]+$/;
    document.getElementById("out").textContent =
      hasNoDigits("codetofun") + "\n" +
      hasNoDigits("user42") + "\n" +
      lettersOnly.test("hello");
  </script>
</body>
</html>

Lines: 0 | Characters: 0

Live Preview Auto-refresh on Run

JavaScript RegExp [^0-9] — validate no digits (Try It)