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JavaScript String lastIndexOf() Method

JavaScript String Reference JavaScript String Reference

Example

Search a string for the last occurrence of "planet":

var str = "Hello planet earth, you are a great planet.";
var n = str.lastIndexOf("planet");

The result of n will be:


Try it yourself »


Definition and Usage

The lastIndexOf() method returns the position of the last occurrence of a specified value in a string.

Note: The string is searched from the end to the beginning, but returns the index starting at the beginning, at postion 0.

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

Note: The lastIndexOf() method is case sensitive!

Tip: Also look at the indexOf() method.


Browser Support

Internet Explorer Firefox Opera Google Chrome Safari

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


Syntax

string.lastIndexOf(searchvalue,start)

Parameter Values

Parameter Description
searchvalue Required. The string to search for
start Optional. The position where to start the search (searching backwards). If omitted, the default value is the length of the string

Return Value

Type Description
Number The position where the specified searchvalue occurs for the last time, or -1 if it never occurs

Technical Details

JavaScript Version: 1.0


More Examples

Example

Search a string for the last occurrence of "planet", starting the search at position 20:

var str = "Hello planet earth, you are a great planet.";
var n = str.lastIndexOf("planet", 20);

The result of n will be:


Try it yourself »



JavaScript String Reference JavaScript String Reference

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