Adjust regular expressions for Filemetadata resource. CAF-203

Can somebody check if the regular expressions I am using are ok? In particular RX_OUTDSLFN (used for fmd_outdataset, should match something like '/GenericTTbar/riahi-AsoTestPublicationv4-4ab251c3a1d9f6622d24e040a40a47ab/USER') and RX_LFN (used for fmd_lfn, should match something like '/store/temp/user/spiga/GenericTTbar/TFileServiceTest/5b6a581e4ddd41b130711a045d5fecb9/1000/log/job.log_25_UO7K6A.tgz')

With the parent lfn I was more loose and the regex should be ok.