SQL Server 2005:charindex starting from the end

Question

I have a string \'some.file.name\',I want to grab \'some.file\'.

To do that,I need to find the last occurrence of \'.\' in a string.

My solution is :

Answer 1

This will also work:

DECLARE
     @test     VARCHAR(100)

SET @test = 'some.file.name'

SELECT
     LEFT(@test, LEN(@test) - CHARINDEX('.', REVERSE(@test)))