HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Read ignoreCase</title>
</head>
<body>
  <h1>ignoreCase property</h1>
  <pre id="out"></pre>
  <script>
    var withIgnoreCase = /hello/i;
    var withoutIgnoreCase = /hello/;
    document.getElementById("out").textContent =
      withIgnoreCase.ignoreCase + "\n" +
      withoutIgnoreCase.ignoreCase;
  </script>
</body>
</html>

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JavaScript RegExp ignoreCase — read property (Try It)