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How to isolate portion of string and remove excess in Notepad++ using regex?

I am attempting to isolate a particular section of a line, and delete everything else after it.
Below are some example strings on what the general formatting of the file looks like. Each one of these lines I am attempting to isolate the Collection-ID.Package-name and remove the.(Version)

DGL1PLAN_PUT_PFC.FCA#FKS.(CAD17_2013-01-30-21.35.29)
DSN8CC91.DSN8CLTC.(2015-01-14-16.33.06.616783)
DSNAOCLI.DSNCLICS.(UQ40167)
DSNJAR.DSNX9DIJ.(UK81051)

Into:

DGL1PLAN_PUT_PFC.FCA#FKS
DSN8CC91.DSN8CLTC
DSNAOCLI.DSNCLICS
DSNJAR.DSNX9DIJ

I have not figured out how to delete the lines, but I have figured out (I think) how to isolate them by themselves. I am currently using ^.*(?=..(CAD)) to highlight everything before the .() on the lines. I am learning Regex and to my understanding and google searches:
^ is the beginning of the string
. finds any character except newlines
* finds 0 or more of the previous type
( begins search
?= is positive lookahead
..(CAD) is the search term I used to get it to highlight the string I want to isolate
) ends the search
I am unsure of how to delete the excess but have managed to highlight the portion I want to keep.
Here is an image of what I’ve figured out so far:

Attempt