User Guide

800 Chapter 2:

String.lastIndexOf()

Availability

Flash Player 5.

Usage

my_str.lastIndexOf(substring:String, [startIndex:Number]) : Number

Parameters

substring

String; the string for which to search.

startIndex Number; an optional integer specifying the starting point from which to search for

substring.

Returns

A number; 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. This index is zero-based, meaning

that the first character in a string is considered to be at index 0—not index 1. If

substring is not

found, the method returns -1.

Example

The following example shows how to use lastIndexOf() to return the index of a certain

character:

var searchString:String = "Lorem ipsum dolor sit amet.";

var index:Number;

index = searchString.lastIndexOf("L");

trace(index); // output: 0

index = searchString.lastIndexOf("l");

trace(index); // output: 14

index = searchString.lastIndexOf("i");

trace(index); // output: 19

index = searchString.lastIndexOf("ipsum");

trace(index); // output: 6

index = searchString.lastIndexOf("i", 18);

trace(index); // output: 6

index = searchString.lastIndexOf("z");

trace(index); // output: -1