jason825, we speak of using the filter section in Mp3tag, right?
Following example demonstrates how to filter a bunch of tracks so that all tracks with filenames of the wanted format will be in view, and all other filenames are out of view.
For example, given is this complete FileBaseName:
"32 - BACH - SICUT LOCUTUS EST.mp3"
You can see three different parts divided by delimiter strings of " - " ([space][hyphen][space]).
And given is this complete FileBaseName:
"Angela Hewitt - 01 - The Well-Tempered Clavier (48), collection of preludes & fugues in 2 Books, BWV 846-893 (BC L80-127); Book 1. No. 1 in C major. Prelude.mp3"
The second filename follows the same format structure as the first filename.
There are three parts divided by a delimiter string " - ".
Well, the sequence and significance of the parts are different in both cases, but this is not relevant for this observation ("track - artist - title" vs. "artist - track - title").
To simplify the given problem, the basic format can be written as:
"A - B - C".
There are three parts divided by delimiter string " - ".
The Mp3tag filtering section provides the usage of so called regular expressions.
(How to read and write a regular expression find other sources for yourself.)
For the above example someone can write a regular expression notated as following:
(.+) - (.+) - (.+)
To complete this into a well formatted filter expression including a bit of fuzzyness regarding the delimiter strings ("\s" means any character that looks like a space character) will give:
%_FILENAME% MATCHES "^(.+)\s-\s(.+)\s-\s(.+)$"
While at the filter section, the round brackets are not needed in general, so the following expression behaves the same:
%_FILENAME% MATCHES "^.+\s-\s.+\s-\s.+$"
This filter expression displays all filenames with a structure of "A - B - C"
To put such filenames into view that matches the inverse case:
NOT %_FILENAME% MATCHES "^(.+)\s+-\s+(.+)\s+-\s+(.+)$"
Now you should be able to adapt it to your needs. Good luck!