# 'Format Value' behavior with Unmatched $regexp

**URL:** <https://community.mp3tag.de/t/format-value-behavior-with-unmatched-regexp/16300>\
**Category:** Support\
**Created:** [November 7, 2014, 10:15pm UTC](https://community.mp3tag.de/t/format-value-behavior-with-unmatched-regexp/16300 "2014-11-07T22:15:29Z")\
**Posts on this page:** 1\
**Showing post:** 9

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**Author:** ![DetlevD](https://community.mp3tag.de/user_avatar/community.mp3tag.de/detlevd/32/123_2.png) [@DetlevD](https://community.mp3tag.de/u/DetlevD)\
**Post date:** [November 30, 2014, 8:12am UTC](https://community.mp3tag.de/t/format-value-behavior-with-unmatched-regexp/16300/9 "2014-11-30T08:12:17Z")

</div>

> [@musicdemon](#):
>
> Yeah, it matches at the [regexpal.com](http://regexpal.com) tester, but not other engines or in mp3tag. ...

When I wrote ...

_This works for me ...  
TITLE MATCHES "^.[\W-.\s]Op(?:us)?[-.\s]?(\d+).\*?$"_

... then it works in Mp3tag.  
I checked it thrice using your examples.

See there for other inspiration ...  
[/t/16152/1](https://community.mp3tag.de/t/16152/1)

DD.20141130.1026.CET

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