howto filter-out a specific word or string

You could also sort first by comment, and then by genre.
Anyways, this will show all files that do not have the word Retagged in their comment:
^([^R]|R[^e]|Re[^t]|Ret[^a]|Reta[^g]|Retag[^g]|Retagg[^e]|Retagge[^d])*.{0,7}$