HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>ignoreCase and flags</title>
</head>
<body>
  <h1>Compare property and flags</h1>
  <pre id="out"></pre>
  <script>
    var regex = new RegExp("hello", "gi");
    document.getElementById("out").textContent =
      regex.ignoreCase + "\n" +
      regex.global + "\n" +
      regex.flags + "\n" +
      regex.flags.includes("i");
  </script>
</body>
</html>

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JavaScript RegExp ignoreCase — flags (Try It)