# String.lastIndexOf()

#### Availability

Flash Player 5.

#### Usage

    my_str.lastIndexOf(substring, [startIndex])

#### Parameters

`substring` An integer or string specifying the string to be searched for.

`startIndex` An integer specifying the starting point to search for `substring`. This parameter is optional.

#### Returns

The position of the last occurrence of the specified substring, or -1.

#### Description

Method; searches the string from right to left and returns the index of the last occurrence of `substring` found before `startIndex` within the calling string. If `substring` is not found, the method returns -1.