List users from a group

[dukkse]

Hey!!

I have an OU structure with 7 top OU:s.
Each one of them have several subOU:s in several levels (we are a global company).
In the end OU (bottom one) there is a bunch of groups and a common thing for the group names are that they contain a common lettercomination together with the group name.

I want to do a search from one of the top level OU:s and all the way down, for the common lettercombination, and for thoose groups that have this, I would like to list all users and export the group name and users within that group to a textfile.

So the list will look like this:
XBR - Groupname
ben.hur
lisa.gonzalez

XBR - Groupname2
ben.joseph
the.hulk

Any help for the searchengine and best way of connection here would be appreciated, the rest I could probably figure out myself..

Thanks
Daniel