RegExp in JavaScript with Case Sensitive Modifier

Question

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>

@Gumbo Thats what the problem is. RegExp should return false because there is no uppercase E in the string The best things in life are free — sandbox
– sandbox, Commented Feb 12, 2012 at 12:18

AD7six · Accepted Answer · 2012-02-13 23:03:19Z

5

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

edited Feb 13, 2012 at 23:03

answered Feb 12, 2012 at 12:18

AD7six

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