lastIndexOf Method (Windows Scripting - JScript)

 

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

Syntax

strObj.lastIndexOf(substring[, startindex])

Arguments

• strObj
  Required. A String object or literal.

• 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.

The following example illustrates the use of the lastIndexOf method.

var str = "time, time";

var s = "";
s += "time is at position " + str.lastIndexOf("time");
s += "<br />";
s += "abc is at position " + str.lastIndexOf("abc");

document.write(s);

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

Requirements

Version 1

Applies To: String Object (Windows Scripting - JScript)

Change History

Date	History	Reason
March 2009	Improved example code.	Information enhancement.

See Also

indexOf Method (Windows Scripting - JScript)