HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Safe replace</title>
</head>
<body>
  <h1>replace() with \b</h1>
  <pre id="out"></pre>
  <script>
    var sentence = "My cat loves the catalog.";
    var safe = sentence.replace(/\bcat\b/g, "dog");
    var unsafe = sentence.replace(/cat/g, "dog");
    document.getElementById("out").textContent = safe + "\n" + unsafe;
  </script>
</body>
</html>

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JavaScript RegExp \b — replace whole word (Try It)