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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>match global</title>
</head>
<body>
  <h1>match() with global</h1>
  <pre id="out"></pre>
  <script>
    var text = "red green red";
    var globalRe = /red/g;
    var localRe = /red/;
    document.getElementById("out").textContent =
      JSON.stringify(text.match(globalRe)) + "\n" +
      JSON.stringify(text.match(localRe));
  </script>
</body>
</html>

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JavaScript RegExp global — match() behavior (Try It)