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<html lang="en">
<head>
  <meta charset="utf-8">
  <title>match() with g</title>
</head>
<body>
  <h1>Global match()</h1>
  <pre id="out"></pre>
  <script>
    var text = "cat dog cat bird cat";
    document.getElementById("out").textContent =
      JSON.stringify(text.match(/cat/g)) + "\n" +
      JSON.stringify(text.match(/cat/));
  </script>
</body>
</html>

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JavaScript RegExp g modifier — match() all (Try It)