how to eliminate @ character and following word from filename?

i have got a flename like this.
his song@god(collections).mp3

i want title from this - to be like this
his song.mp3

i should get album name as>collections.

i tried guessvalue-%title%@%dummy%album%
but it does not work.

%title%%album% gives

his song as title
@god(collections) as album.

i want to get the @ character and the following word eliminated from the album name.
kindly help.

Convert | Filename - Tag | ALT+2

Select format string

Formatstring: his song@god(collections).mp3
%title%@%dummy%(%album%)

Preview
title | his song
album | collections

DD.20090318.2225.CET

thanks a lot for the suggestion. it works!
thanks a lot for the developers of this software. have a nice day.