No_spaces <- String ' ' '_'
No_spaces_2 <- String ' ' '_' # Position

File_name <- F_name '.MP3' '.mp3' # Position_{.ext}
' Position_{.ext} = F_name._ - '.mp3'._

Name <- File_name # 1 (Position_{.ext} - 1) [ Position_{.ext} ] | File_name
' Position_{.ext} <- File_name '.' STR_RIGHT
