JavaScript indexOf() Method

Complete String Object Reference

Definition and Usage

The indexOf() method returns the position of the first occurrence of a specified string value in a string.

Syntax

stringObject.indexOf(searchvalue,fromindex)

Tips and Notes

Note: The indexOf() method is case sensitive!

Note: This method returns -1 if the string value to search for never occurs.

Example

In this example we will do different searches within a "Hello world!" string:

<script type="text/javascript">

var str="Hello world!";
document.write(str.indexOf("Hello") + "<br />");
document.write(str.indexOf("World") + "<br />");
document.write(str.indexOf("world"));

</script>

The output of the code above will be:

0
-1
6

Try-It-Yourself Demos

indexOf()
How to use indexOf() to search within a string.

Complete String Object Reference

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