Minimize redundant information

[ohrenkino]

I would think instead of

@Roland

$regexp($reverse($regexp($regexp($reverse($regexp($regexp(%Genre%,'^(\s+;*|\s*;+)+|(\s+;*|\s*;+)+$|((?<=;)\s+)|(\s+(?=;))',),'^|,';')),'(;[^;]+)(?=(\1|;.*?\1))',),'^;+|;+,)),'(?<=;)',' ')

Convert>tag-Tag for DUPLICATEPERFORMER
Format string:
$regexp($reverse($regexp($regexp($reverse($regexp($regexp(%DUPLICATEPERFORMER %,'^(\s+;*|\s*;+)+|(\s+;*|\s*;+)+$|((?<=;)\s+)|(\s+(?=;))',),'^|,';')),'(;[^;]+)(?=(\1|;.*?\1))',),'^;+|;+,)),'(?<=;)',' ')