# String.indexOf()

#### Availability

Flash Player 5.

#### Usage

    my_str.indexOf(substring, [startIndex])

#### Parameters

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

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

#### Returns

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

#### Description

Method; searches the string and returns the position of the first occurrence of the specified `substring`. If the value is not found, the method returns -1.