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JavaScript substr() Method

Definition and Usage

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

Syntax

stringObject.substr(start,length)

Parameter Description
start Required. Where to start the extraction. Must be a numeric value
length Optional. How many characters to extract. Must be a numeric value.


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

JavaScript substr() Method Reviewed by 1000sourcecodes on 20:55 Rating: 5
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