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Editorial Team
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Asked: 2026-05-29T17:10:57+00:00

In the following code, I have used RegExp to check E with Case Sensitive

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In the following code, I have used RegExp to check E with Case Sensitive Modifier i in the string The best things in life are free. But it is returning true even if there is no uppercase E in the string.

<html>
<body>

<script type="text/javascript">
var patt1=new RegExp("E","i");

document.write(patt1.test("The best things in life are free"));
</script>

</body>
</html>
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1 Answer

  1. Editorial Team

    Regular expressions are case sensitive by default just get rid of the i flag. The i flag stands for ignore case.

    note it’s typically easier to write regular expressions as:

    /E/.test(inputstring)

    but if you’re just testing for the presence of a fixed string it’s better to not use a regex at all

    containsChar = (inputstring.indexOf('E') > -1);

    You can find out more about regular expressions and indexOf on mozilla’s javascript reference site

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