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<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="utf-8">

  <title>{2} vs {2,}</title>

</head>

<body>

  <h1>Exact vs at-least</h1>

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

  <script>

    ["a", "aa", "aaa"].forEach(function (s) {

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

        s + " → {2}=" + /a{2}/.test(s) + " {2,}=" + /a{2,}/.test(s) + "\n";

    });

  </script>

</body>

</html>

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JavaScript RegExp {X,} quantifier — {2} vs {2,} (Try It)