JavaScript substr() Method

Complete String Object Reference

Definition and Usage

The substr() method extracts a specified number of characters in a string, from a start index.

Syntax

stringObject.substr(start,length)

Tips and Notes

Note: To extract characters from the end of the string, use a negative start number (This does not work in IE).

Note: The start index starts at 0.

Note: If the length parameter is omitted, this method extracts to the end of the string.

Example

In this example we will use substr() to extract some characters from a string:

<script type="text/javascript">

var str="Hello world!";
document.write(str.substr(3));

</script>

The output of the code above will be:

lo world!

Example

In this example we will use substr() to extract some characters from a string:

<script type="text/javascript">

var str="Hello world!";
document.write(str.substr(3,7));

</script>

The output of the code above will be:

lo worl

Try-It-Yourself Demos

substr()
How to use substr() to extract some characters from a string.

Complete String Object Reference

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