(&(!(objectClass=Impresoras))(uid=s*))
(&(objectClass=user)(uid=*))
&
or |
Example: (&(directory=val1)(folder=public))
(&(objectClass=VALUE1)(type=Epson*))
VALUE1 = *)(ObjectClass=*))(&(objectClass=void
(&(objectClass=
*)(ObjectClass=*))
will be the first filter (the one executed).