First create an action of the type "merge duplicate fields" for comment and use as separator the underscore _.
After this you have the contents of the comment fields in one comment field.
Now create an action of the type "Format tag-field" for CATEGORIES with the
format string: %comment%
This copies the content of COMMENT to CATEGORIES.
Then create an action of the type "Split field by Separator" for CATEGORIES with the separator underscore _.
You should now have multiple instances of CATEGORIES in the files.
Do whatever you like with the contents of COMMENT.
You have pointed to an outside forum's message, which depends on a forum thread from here ... /t/9027/1
If you see this text ... "Categories – Trumpet\\Genius" ...
in Mp3tag within a listview field or tag panel field, ..
then you have to do with a so called "multi-value" tag-field, ...
because Mp3tag uses the "\\ double backslash" as the visual delimiter for multi values stored within one tag-field ...
Value 1: Categories – Trumpet
Value 2: Genius
Because you want to create a new multi-value tag-field CATEGORIES ...
out of textual parts from the tag-field COMMENT, ...
to be extracted from each single value out of the multi-value tag-field COMMENT, ...
then you have to do it in few steps.
Remove the unwanted text, for example by splitting the given text into parts.
Action "Guess values"
Source format: %CATEGORIES%
Guessing pattern: %DUMMY% – %CATEGORIES%
CATEGORIES = 'Trumpet~Genius'
Make CATEGORIES multi-value.
Action "Split field by separator"
CATEGORIES = 'Trumpet'
CATEGORIES = 'Genius'
In a previous version of MP3Tag, whenever i would perform a REGEX on multiple files, the values with "\\" in them would automatically be split over multiple tags. Which, i guess, is the intended behaviour.
In the current version of MP3Tag v2.69 however, the '\\' doesn't seem to split the values over multiple tags. To force "\\" conversion to multiple values, i have to CTRL+S the files individually.
So after REGEX i'm left with what is seen on Extended Tags screenshot.
As you can see its not a visual representation but rather literal one.
Now, if i apply the tags above with your action, the results has some undesired effects: Action "Format value"
Formatstring: $replace($meta_sep(COMMENT,'~'),'Categories – ',,'~','\\')
White = need attention, it gets CATEGORIES as fieldname
Purple = split values
Grey = original tags
Obviously the desired format would be:
ARTIST LOCATION = American
CATEGORIES = Genius
CATEGORIES = Trumpet
TRACK DECADE = 2010s
Maybe an even better approach? This way B would always the end up with the correct fieldname.
1. Is there a way to target fieldname A
2. Split B and C from the values
3. and then assign B as new fieldname, with C as value
Yes, so far it was, even in Mp3tag v2.69 as I can tell.
Obviously you are a friend of special characters.
Well I have already detected, that you have used in your examples the en-dash '–' instead of the standard hyphen '-'.
But that you are so angry, and cheat us with the backslash too, I had not expected.