JavaScript String lastIndexOf() Method

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

If the value cannot be found, it will return-1.

If the value exists multiple times, it will return the position of the last occurrence.

If you want to search from the beginning to the end, please useindexOf()method.

Note:For more information on Array methods, please refer toArray.lastIndexOf().

Syntax:

string.lastIndexOf(searchValue, start)

Example

var　str　=　'Hello　world,　I　repeat　Hello　world';
str.lastIndexOf('Hello');

Note:This method is case-sensitive.

All browsers fully support the lastIndexOf() method:

Method
lastIndexOf()	Is	Is	Is	Is	Is

Parameter	Description
searchValue	(Required) A string representing the value to search for
start	(Optional) An integer representing the index to start searching from (search forward); the default is the length of the string

Return value:	the last occurrence ofsearchValueindex, if not found, then-1
JavaScript version:	ECMAScript 1

Return the last position of the character 'O' in the string, at position5Start searching (search forward):

Example

var　str　=　'HELLO　WORLD　HELLO';
str.lastIndexOf('O',　5);