I have the following code:

var key = "Force";

var phrase = "May the Force be with you";

I need to search for the key in phrase in a case-insensitive way.

It needs to be fast and reliable. I think a custom regex may be best here, but am not sure what is the best way to implement the same.

Any suggestions? What's the best way to do this in JavaScript?

I have the following code:

var key = "Force";

var phrase = "May the Force be with you";

I need to search for the key in phrase in a case-insensitive way.

It needs to be fast and reliable. I think a custom regex may be best here, but am not sure what is the best way to implement the same.

Any suggestions? What's the best way to do this in JavaScript?

• javascript
• regex

Share Improve this question Follow edited Jun 26, 2011 at 5:51 painotpi 6,99222 gold badges3939 silver badges7272 bronze badges asked Jun 26, 2011 at 5:43 User1234894User1234894 1322 silver badges44 bronze badges 1

• Hi fellas. How do I use search's case-insensitive flag with a variable (not plain-text)? – User1234894 Commented Jun 26, 2011 at 5:57

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2 Answers 2

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The i flag is used for case-insensitive search:

phrase.search(/force/i);

You can learn more at the Mozilla docs for the search function and regular expressions.

You can also test your regular expressions (minus JavaScript specific features) at regexpal.

str = "May the Force be with you";
str.search(/Force/i);

This is a regular expression with the i flag, which makes it case insensitive.