# Mp3tag v2.37a - Failure of \[ and \] in format string
**URL:** https://community.mp3tag.de/t/mp3tag-v2-37a-failure-of-and-in-format-string/4067
**Category:** Support
**Created:** [November 15, 2006, 9:45pm UTC](https://community.mp3tag.de/t/mp3tag-v2-37a-failure-of-and-in-format-string/4067 "2006-11-15T21:45:18Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@chrisjj](https://community.mp3tag.de/u/chrisjj)
#### Post date: [November 15, 2006, 9:45pm UTC](https://community.mp3tag.de/t/mp3tag-v2-37a-failure-of-and-in-format-string/4067/1 "2006-11-15T21:45:18Z")
I find that [and] characters in "Tag - Filename" format string are deleted from the result. Known bug? Any chance of a fix?
PS On the change of menu "freedb" to "Tag Sources"... good move! Much clearer.
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### Author:  [@dano](https://community.mp3tag.de/u/dano)
#### Post date: [November 15, 2006, 10:05pm UTC](https://community.mp3tag.de/t/mp3tag-v2-37a-failure-of-and-in-format-string/4067/2 "2006-11-15T22:05:12Z")
Square brackets need to be escaped: '['
[https://docs.mp3tag.de/scripting](https://docs.mp3tag.de/scripting) (at the bottom)
> [@](#):
>
> PS On the change of menu "freedb" to "Tag Sources"... good move! Much clearer.
That was my idea 🙂
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### Author:  [@chrisjj](https://community.mp3tag.de/u/chrisjj)
#### Post date: [November 15, 2006, 10:20pm UTC](https://community.mp3tag.de/t/mp3tag-v2-37a-failure-of-and-in-format-string/4067/3 "2006-11-15T22:20:28Z")
Thanks. Again may I suggest this needs mentioning in the help for this command? "You can use the built-in Scripting functions. " is not sufficient to indicate that in this case one /must/ use a scripting feature! 😉
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### Author:  [@system](https://community.mp3tag.de/u/system)
#### Post date: [February 9, 2026, 12:20pm UTC](https://community.mp3tag.de/t/mp3tag-v2-37a-failure-of-and-in-format-string/4067/4 "2026-02-09T12:20:00Z")