lastIndexOf Method

Returns the index of the last occurrence of a substring within a String object.

function lastIndexOf(substring : String [, startindex : Number ]) : Number

Arguments

• substring
  Required. The substring to search for within the String object.

• startindex
  Optional. Integer value specifying the index to begin searching within the String object. If omitted, searching begins at the end of the string.

Remarks

The lastIndexOf method returns an integer value indicating the beginning of the substring within the String object. If the substring is not found, a -1 is returned.

If startindex is negative, startindex is treated as zero. If it is larger than the greatest character position index, it is treated as the largest possible index.

Searching is performed right to left. Otherwise, this method is identical to indexOf.

Example

The following example illustrates the use of the lastIndexOf method.

var str = "time, time";

print ("time is at position " + str.lastIndexOf("time"));
print ("abc is at position " + str.lastIndexOf("abc"));

// Output:
//   time is at position 6
//   abc is at position -1

Requirements

Version 1

Applies To:

String Object

See Also

Reference

indexOf Method

Change History

Date	History	Reason
July 2009	Modified example.	Content bug fix.
March 2009	Improved example.	Information enhancement.