JavaScript String lastIndexOf() Method

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# JavaScript String lastIndexOf() Method

JavaScript String Object

## Example

Search a string for the last occurence 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

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 occurence 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 Object

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