HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Whole-word alternation</title>
</head>
<body>
  <h1>\b(yes|no)\b</h1>
  <pre id="out"></pre>
  <script>
    var answer = /\b(yes|no)\b/i;
    var text = "Yes! Yesterday was nice. Say no now.";
    var found = text.match(answer);
    document.getElementById("out").textContent =
      JSON.stringify(found) + "\n" +
      answer.test("yesman") + "\n" +
      answer.test("oh yes");
  </script>
</body>
</html>

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JavaScript RegExp \b — yes/no alternation (Try It)