How can I group number of visits based on a part of user name?

My application users use their corporate email address to login to my application. How can get WebLog Expert to group on the domain name after @ in the user name?
Example:

username: user1@company1.com.
I need to group the visits based on company1.com

Would that be possible in a custom table? If yes, what is the correct syntax for the expression?

Thanks,
Ib
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