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<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="utf-8">

  <title>test() with i</title>

</head>

<body>

  <h1>Case insensitive</h1>

  <pre id="out"></pre>

  <script>

    var regex = /hello/i;

    document.getElementById("out").textContent =

      "hello world → " + regex.test("hello world") + "\n" +

      "HELLO World → " + regex.test("HELLO World") + "\n" +

      "hi there → " + regex.test("hi there");

  </script>

</body>

</html>

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JavaScript RegExp test() — case insensitive (Try It)