regex in search filter?

[Damien Messner <messner_d@yahoo.fr>]

I made a search like this:
(&(objectClass=groupofnames)(member=*))

with :
member= cn=grp1,ou=groupes,dc=xxxx,dc=xx
               uid=dmessner,ou=employes,dc=xxxx,dc=xx

and it works, but now I would like to show only few result, so I would 
like to make a filter with regex  in order to show
only result starting with uid=dm* or cn=*
But when I do this:
(&(objectClass=groupofnames)(member=uid=*))
openLDAP gives me no result. Perhaps because I have more than one value 
in membe, or due to "=" caractere...