METHOD:  String::lastIndexOf
object.lastIndexOf(searchValue,[fromIndex])

When called from a String object, this method returns the index of the last occurrence of the specified searchValue argument, searchng backwards from the specified fromIndex argument. If the searchValue is not found, a value of -1 is returned. Chaacters in the string are indexed from left to right with the first character indexed as 0 and the last as String.length-1. Note that this method is case sensitive as shown in the example below.

The following code uses the lastIndexOf method to find the index values of four different character strings within the myString object. Note that the third example returns -1 because there is no occurrence of the specified string before index value 6, and the fourth example returns -1 because the case of one of the characters does not match.

Code:
myString = new String("DevGuru.com")
document.writeln(myString.lastIndexOf("u"))
document.writeln("<br>" + myString.lastIndexOf("u",5))
document.writeln("<br>" + myString.lastIndexOf("com",6))
document.writeln("<br>" + myString.lastIndexOf("Com"))

Output:
6
4
-1
-1
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