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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>jQuery lang pipe match test</title>
  <style>
    #log { font-family: monospace; white-space: pre-line; margin-top: 12px; }
  </style>
</head>
<body>
  <p>Testing [lang|='en'] on sample values:</p>
  <div id="log"></div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    var samples = ["en", "en-US", "en-GB", "english", "fr", "enUS"];
    var lines = [];
    samples.forEach(function(code) {
      var $el = $("<span>").attr("lang", code).appendTo("body");
      var hit = $el.is("[lang|='en']");
      lines.push(code + " → " + (hit ? "MATCH" : "no"));
      $el.remove();
    });
    $("#log").text(lines.join("\n"));
  </script>
</body>
</html>

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jQuery [lang|='en'] — match rules (Try It)