Convert user names during import?
 

I am importing a board from dotNetBB that uses AD authentication. Eventually, my vbulletin site will use AD authentication as well. The user names in dotNetBB are in the form [domain]\[username].

For example: localdomain\johndoe

What I need for my vbulletin board is just the user name. Can I edit anything in the impex code to filter out the domain name from the user name? Or should I just perform the import, then use a SQL query to filter out the domain name from the user name? If I go the SQL query route, are the user names just contained to the users table?

Thanks.