HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>jQuery not-equal match test</title>
  <style>
    #log { font-family: monospace; white-space: pre-line; margin-top: 12px; }
  </style>
</head>
<body>
  <p>Testing [name!='newsletter']:</p>
  <div id="log"></div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    var cases = [
      { label: "newsletter", name: "newsletter" },
      { label: "accept", name: "accept" },
      { label: "no name", name: null }
    ];
    var lines = [];
    cases.forEach(function(c) {
      var $el = $("<input type='radio'>");
      if (c.name) { $el.attr("name", c.name); }
      $el.appendTo("body");
      lines.push(c.label + " → " + ($el.is("[name!='newsletter']") ? "MATCH" : "no"));
      $el.remove();
    });
    $("#log").text(lines.join("\n"));
  </script>
</body>
</html>

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jQuery [name!='newsletter'] — match rules (Try It)