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<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="utf-8">

  <title>Full line match</title>

</head>

<body>

  <h1>^ and $ together</h1>

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

  <script>

    var hexColor = /^#[0-9a-f]{6}$/i;

    var samples = ["#ff00aa", "#ff00", "color #ff00aa"];

    document.getElementById("out").textContent = samples.map(function (s) {

      return s + " → " + hexColor.test(s);

    }).join("\n");

  </script>

</body>

</html>

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JavaScript RegExp $ quantifier — full-line validation (Try It)