Split a tag to multiple tags

General Discussion
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/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.

  1. Copy COMMENT (meta values) to CATEGORIES (merged values).
    Action "Format value"
    Field: CATEGORIES
    Formatstring: $meta_sep(COMMENT,'~')
    Result ...
    CATEGORIES = 'Categories – Trumpet~Genius'

  2. Remove the unwanted text, for example by splitting the given text into parts.
    Action "Guess values"
    Source format: %CATEGORIES%
    Guessing pattern: %DUMMY% – %CATEGORIES%
    Result ...
    CATEGORIES = 'Trumpet~Genius'

  3. Make CATEGORIES multi-value.
    Action "Split field by separator"
    Field: CATEGORIES
    Separator: ~
    Result ...
    CATEGORIES = 'Trumpet'
    CATEGORIES = 'Genius'

  4. Ready.

All steps consolidated into one step ...

Action "Format value" Field: CATEGORIES Formatstring: $replace($meta_sep(COMMENT,'~'),'Categories – ',,'~','\\\\')

DD.20150321.1216.CET