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JavaScript String substr() Method

JavaScript String Reference JavaScript String Reference

Example

Extract parts of a string:

var str = "Hello world!";
var res = str.substr(1, 4)

The result of res will be:

ello

Try it yourself »

More "Try it Yourself" examples below.


Definition and Usage

The substr() method extracts parts of a string, beginning at the character at the specified position, and returns the specified number of characters.

Tip: To extract characters from the end of the string, use a negative start number (This does not work in IE 8 and earlier).

Note: The substr() method does not change the original string.


Browser Support

Method
substr() Yes Yes Yes Yes Yes


Syntax

string.substr(start,length)

Parameter Values

Parameter Description
start Required. The position where to start the extraction. First character is at index 0
length Optional. The number of characters to extract. If omitted, it extracts the rest of the string

Technical Details

Return Value: A new String, containing the extracted part of the text. If length is 0 or negative, an empty string is returned
JavaScript Version: 1.0


Examples

More Examples

Example

Begin the extraction at position 2, and extract the rest of the string:

var str = "Hello world!";
var res = str.substr(2)

The result of res will be:

llo world!

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Example

Extract only the first character:

var str = "Hello world!";
var res = str.substr(0, 1)

The result of res will be:

H

Try it yourself »

Example

Extract only the last character:

var str = "Hello world!";
var res = str.substr(11, 1)

The result of res will be:

!

Try it yourself »


JavaScript String Reference JavaScript String Reference

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