Export txt file with square brackets

I want to make txt file with information thal looks like

[b]01. [/b]Down the River
[b]02. [/b]Mr. Devil and the Black Widow Woman
[b]03. [/b]The Hillside
[b]04. [/b]Wicked Well
....

But i can`t make "[" or "]".

Search the forum for "single quote around reserved characters" ...
... or read the Mp3tag Help Manual
https://docs.mp3tag.de/scripting
... at the end of the page.

If you want to output literal strings from within a Mp3tag export script, then enclose all literal strings in single quotes and leave all Mp3tag scripting elements as is, e. g.

'[b]'$num(%track%,2)'.[/b] '%title%

If you use an editor with support for Mp3tag syntax coloring, then the parts will be obvious, what is Mp3tag scripting syntax and what is literal output.

DD.20100514.1010.CEST

Thanks, it works. I used `, not '.