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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>String.match()</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    var paragraph = "The quick brown fox jumps over the lazy dog. It barked.";
    var found = paragraph.match(/[A-Z]/g);
    document.getElementById("out").textContent = found.join(",");
  </script>
</body>
</html>

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String.match() — basic global (Try It)