LDAP: More than one searchfilter

Hi, just one other question, how is it possible to have (or control) more than one filter in the ldap module? I use our LDAP to have access via PEAP or EAP-TLS, this works, thanks to this list. The problem now is, that workstations are stored as WORKSTATIONNAME$ (with a $ ath the end, thanks to Samba) and the user is stored with it's username. Unfortunately, the workstations come in their Radius-Request without the "$" sign, just the name. So if I want to lookup a workstationname I have to add a "$" sigh to every request, or LDAP won't find it. Otherwise the $ shouldn't be added while looking for a username. Is there an idea how to control the ldap filter for this? TIA Alex