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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 »


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

Internet Explorer Firefox Opera Google Chrome Safari

The substr() method is supported in all major browsers.


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

Return Value

Type Description
String A new string containing the extracted part of the text. If length is 0 or negative, an empty string is returned

Technical Details

JavaScript Version: 1.0


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!

Try it yourself »

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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