HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>jQuery hreflang prefix selector</title>
  <style>
    a { display: inline-block; margin: 8px; padding: 6px 10px; }
  </style>
</head>
<body>
  <a href="#" hreflang="en">English (en)</a>
  <a href="#" hreflang="en-US">English US</a>
  <a href="#" hreflang="fr">French</a>
  <a href="#">No hreflang</a>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("a[hreflang|='en']").css("border", "3px dotted green");
  </script>
</body>
</html>

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jQuery a[hreflang|='en'] — official demo (Try It)