HTML Code

<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="utf-8">

  <title>(ha){2,}</title>

</head>

<body>

  <h1>Group at least twice</h1>

  <pre id="out"></pre>

  <script>

    ["ha", "haha", "hahaha", "hahahaha"].forEach(function (w) {

      document.getElementById("out").textContent +=

        w + " → " + /(ha){2,}/.test(w) + "\n";

    });

  </script>

</body>

</html>

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JavaScript RegExp {X,} quantifier — group repeat (Try It)