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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>[^0-9] match()</title>
</head>
<body>
  <h1>match() with [^0-9]</h1>
  <pre id="out"></pre>
  <script>
    var code = "404NotFound";
    var first = code.match(/[^0-9]/);
    var all = code.match(/[^0-9]/g);
    document.getElementById("out").textContent =
      first[0] + "\n" +
      JSON.stringify(all);
  </script>
</body>
</html>

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