HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>jQuery attribute not equal selector</title>
  <style>
    div { margin: 10px 0; }
    span { margin-left: 8px; }
  </style>
</head>
<body>
  <div>
    <input type="radio" name="newsletter" value="Hot Fuzz">
    <span>name is newsletter</span>
  </div>
  <div>
    <input type="radio" value="Cold Fusion">
    <span>no name</span>
  </div>
  <div>
    <input type="radio" name="accept" value="Evil Plans">
    <span>name is accept</span>
  </div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("input[name!='newsletter']").next().append("<b>; not newsletter</b>");
  </script>
</body>
</html>

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jQuery input[name!='newsletter'] — official demo (Try It)