HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>colou?r</title>
</head>
<body>
  <h1>Spelling variants</h1>
  <pre id="out"></pre>
  <script>
    var words = ["color", "colour", "coloor"];
    document.getElementById("out").textContent = words.map(function (w) {
      return w + " → " + /colou?r/.test(w);
    }).join("\n");
  </script>
</body>
</html>

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JavaScript RegExp ? quantifier — colou?r spelling (Try It)