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Editorial Team
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Asked: 2026-05-26T18:44:11+00:00

My understanding is that one can use either of the two methods for case-insensitive

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My understanding is that one can use either of the two methods for case-insensitive regex based matches in JavaScript: match(/pattern/i) or match("pattern","i"). I’m not getting the second variation to work in Chrome though. (I’m using Chromium 14.0.835.202). Is this a bug in Chrome? (or a user error?)

In Firefox when I run this code I get: Hello World and then Hello World. In Chrome I get Hello World, undefined.

<html>
<head>
</head>
<body>

<input type="button" id="button" value="Click me!" onclick="buttonClick()" />

</body>

<script language="javascript">
function buttonClick()
{
  str="Hello World"
  alert(str.match(/hello world/i))
  alert(str.match("hello world","i"))
}
</script>
</html>
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1 Answer

  1. Editorial Team

    No, it’s not a bug. Firefox allows the use of the flags parameter in String.match, but as noted on the Mozilla Documentation (or rather, as it used to be noted – this functionality is no longer even mentioned) it’s nonstandard and should be avoided. Also, it’s usually less efficient.

    If you need this functionality, use new RegExp instead.

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