HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Name title alternation</title>
</head>
<body>
  <h1>Match titles</h1>
  <pre id="out"></pre>
  <script>
    var titlePattern = /(Mr\.|Mrs\.|Ms\.|Dr\.)\s+[A-Z][a-z]+/g;
    var text = "Mr. Smith and Dr. Lee met Mrs. Jones.";
    var titles = text.match(titlePattern);
    var captured = text.match(/(Mr\.|Mrs\.|Ms\.|Dr\.)/);
    document.getElementById("out").textContent =
      JSON.stringify(titles) + "\n" + captured[1];
  </script>
</body>
</html>

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JavaScript RegExp (x|y) — name titles (Try It)