HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>jQuery pipe vs caret attribute</title>
  <style>
    #samples span { display: block; margin: 4px 0; font-family: monospace; }
    #log { font-family: monospace; white-space: pre-line; margin-top: 12px; }
  </style>
</head>
<body>
  <div id="samples">
    <span lang="en">en</span>
    <span lang="en-US">en-US</span>
    <span lang="english">english</span>
    <span lang="enable">enable</span>
  </div>
  <div id="log"></div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    var lines = [];
    $("#samples span").each(function() {
      var $s = $(this);
      lines.push(
        $s.attr("lang") +
        " | pipe: " + $s.is("[lang|='en']") +
        " | caret: " + $s.is("[lang^='en']")
      );
    });
    $("#log").text(lines.join("\n"));
  </script>
</body>
</html>

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jQuery [lang|='en'] vs [lang^='en'] (Try It)