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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>\b vs \B</title>
</head>
<body>
  <h1>Boundary contrast</h1>
  <pre id="out"></pre>
  <script>
    var sentence = "My cat loves scatter and catalog.";
    document.getElementById("out").textContent =
      JSON.stringify(sentence.match(/\bcat\b/g)) + "\n" +
      JSON.stringify(sentence.match(/\Bcat\B/g)) + "\n" +
      JSON.stringify(sentence.match(/cat/g));
  </script>
</body>
</html>

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JavaScript RegExp \B — vs \b contrast (Try It)