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JavaScript String lastIndexOf()

Examples

Search for the last occurrence of "planet":

let text = "Hello planet earth, you are a great planet.";
let result = text.lastIndexOf("planet");
Try it Yourself »
let text = "Hello planet earth, you are a great planet.";
let result = text.lastIndexOf("Planet");
Try it Yourself »

More examples below.


Definition and Usage

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

The lastIndexOf() method searches the string from the end to the beginning.

The lastIndexOf() method returns the index from the beginning (position 0).

The lastIndexOf() method returns -1 if the value is not found.

The lastIndexOf() method is case sensitive.


Syntax

string.lastIndexOf(searchvalue, start)

Parameters

Parameter Description
searchvalue Required.
The string to search for.
start Optional.
The position where to start.
Default value is string length.

Return Value

Type Description
A numberThe position where the search-value occurs.
-1 if it never occurs.


More Examples

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

let text = "Hello planet earth, you are a great planet.";
let result = text.lastIndexOf("planet", 20);
Try it Yourself »

Browser Support

lastIndexOf() is an ECMAScript1 (ES1) feature.

ES1 (JavaScript 1997) is fully supported in all browsers:

Chrome Edge Firefox Safari Opera IE
Yes Yes Yes Yes Yes Yes