How to remove duplicated names within a tag

[ohrenkino]

See this thread:

Merging several Tag Fields into CONTENTGROUP

... and here it goes ... Note: If we could sort a delimited itemlist within a tag-field, Mp3tag life would be much easier! If we could repeat one action in a loop, Mp3tag life would be much easier! Example itemlist: ITEMLIST="aaa,aaa,aaa,bbb,ccc,bbb,ddd,ddd,ddd,ccc,eee,fff,GGG,ggg,iii" The itemlist contains 15 items: "aaa" x 3, "bbb" x 2, "ccc" x 2, "ddd" x 3, "eee" x 1, "fff" x 1, "GGG" x 1, "ggg" x 1, "iii" x 1. This regular expression: $regexp(%ITEMLIST%,'(?:^|,)([^,]*)(,\1)+(?=,|$)…