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<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="utf-8">

  <title>Hex color</title>

</head>

<body>

  <h1>Hex color range</h1>

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

  <script>

    document.getElementById("out").textContent =

      ["#abc", "#abcdef", "#ab", "#ghijkl"].map(function (c) {

        return c + " → " + /#[0-9a-fA-F]{3,6}/.test(c);

      }).join("\n");

  </script>

</body>

</html>

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JavaScript RegExp {X,Y} quantifier — hex color (Try It)