# ? in filter string
**URL:** https://community.mp3tag.de/t/in-filter-string/3282
**Category:** Support
**Created:** [May 4, 2006, 6:40am UTC](https://community.mp3tag.de/t/in-filter-string/3282 "2006-05-04T06:40:14Z")
**Posts on this page:** 8
**Page:** 1
### Author:  [@chrisjj](https://community.mp3tag.de/u/chrisjj)
#### Post date: [May 4, 2006, 6:40am UTC](https://community.mp3tag.de/t/in-filter-string/3282/1 "2006-05-04T06:40:14Z")
Anyone know how I can get the filter string to show files with the character ? in the field? Simply entering ? fails - it appears that ? is secretly reserved for some special meaning, presumably windcard. (V2.35a)
Also suggestion to developers: cover the filter string in Help.
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### Author:  [@dano](https://community.mp3tag.de/u/dano)
#### Post date: [May 4, 2006, 7:11am UTC](https://community.mp3tag.de/t/in-filter-string/3282/2 "2006-05-04T07:11:32Z")
The filter uses regular expressions, you must escape certain characters.
Use **?**
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### Author:  [@chrisjj](https://community.mp3tag.de/u/chrisjj)
#### Post date: [May 5, 2006, 12:14pm UTC](https://community.mp3tag.de/t/in-filter-string/3282/3 "2006-05-05T12:14:06Z")
Thanks.
Likewise other characters needing that workaround are: . \* ^ $
Developers: please document! 😉
PS Any idea what filter
Field: /
is for?
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### Author:  [@dano](https://community.mp3tag.de/u/dano)
#### Post date: [May 5, 2006, 12:46pm UTC](https://community.mp3tag.de/t/in-filter-string/3282/4 "2006-05-05T12:46:31Z")
There's no / filter by default, maybe once you entered this as a new tag field by mistake.
The entries in the filter are also derived from the fields you get when you make a new tag in the "Tags..." dialog.
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### Author:  [@chrisjj](https://community.mp3tag.de/u/chrisjj)
#### Post date: [May 5, 2006, 1:48pm UTC](https://community.mp3tag.de/t/in-filter-string/3282/5 "2006-05-05T13:48:41Z")
Thanks.
> maybe once you entered this as a new tag field by mistake.
If so, how does one delete it?
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### Author:  [@dano](https://community.mp3tag.de/u/dano)
#### Post date: [May 5, 2006, 4:39pm UTC](https://community.mp3tag.de/t/in-filter-string/3282/6 "2006-05-05T16:39:17Z")
You can edit the registry or in the latest version, there's a Shift+Del shortcut.
Registry:
HKEY\_CURRENT\_USER\Software\Moebius\Mp3tag\Settings
The string **TagFields** holds all the entries.
Shortcut:
Go to the  "Tags..." dialog and click on the  button. Now choose the field you want to remove and then press SHIFT+DEL.
Then choose any different field and enter a value and press the OK button (this is important).
Back in the "Tags..." dialog, hit Cancel and restart the program.
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### Author:  [@chrisjj](https://community.mp3tag.de/u/chrisjj)
#### Post date: [February 3, 2008, 2:29pm UTC](https://community.mp3tag.de/t/in-filter-string/3282/7 "2008-02-03T14:29:53Z")
Belatedly, thanks Dano - that worked fine.
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### Author:  [@system](https://community.mp3tag.de/u/system)
#### Post date: [February 9, 2026, 12:19pm UTC](https://community.mp3tag.de/t/in-filter-string/3282/8 "2026-02-09T12:19:44Z")