ldap filter and cert-subject

Hello, Is it possible to extract the uid from „TLS-Client-Cert-Subject :=  C=DE/../../UID=username“ in mods-enabled/ldap -> filters? thanks and best regards David Sandmann Universitätsrechenzentrum (URZ) Universität Greifswald Felix-Hausdorff-Str. 12 17489 Greifswald Germany Tel. +49 3834 420 1424 Fax. +49 3834 420 1401