I am a little puzzled: do you want to modify the filename or the metadata field ALBUM?
The filename is maintained by the OS, the field ALBUM is an embedded piece of metadata which probably can be modified by MP3tag.
You say that the album field is formatted in a particular way but it looks an awful lot like a partially qualified filename.
Then it looks to me like you want
but which one:
If you only want to modify the filename, see
Convert>Filename-Filename.
If the string following the ! should get another zero (and it is string %2) then 0%2 would do it.