# Case sensitive filtering?

**URL:** <https://community.mp3tag.de/t/case-sensitive-filtering/52563>\
**Category:** Support\
**Created:** [March 27, 2021, 11:41am UTC](https://community.mp3tag.de/t/case-sensitive-filtering/52563 "2021-03-27T11:41:47Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Etz](https://community.mp3tag.de/user_avatar/community.mp3tag.de/etz/32/7648_2.png) [@Etz](https://community.mp3tag.de/u/Etz)\
**Post date:** [March 27, 2021, 11:41am UTC](https://community.mp3tag.de/t/case-sensitive-filtering/52563/1 "2021-03-27T11:41:48Z")

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For example %\_extension% IS MP3 ?

As per documentation, Mp3Tag only supports case-insensitive filters.

Any workarounds possible?

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**Author:** ![ohrenkino](https://community.mp3tag.de/user_avatar/community.mp3tag.de/ohrenkino/32/4843_2.png) [@ohrenkino](https://community.mp3tag.de/u/ohrenkino)\
**Post date:** [March 27, 2021, 12:04pm UTC](https://community.mp3tag.de/t/case-sensitive-filtering/52563/2 "2021-03-27T12:04:55Z")

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> [@Etz](#):
>
> %\_extension% IS MP3

Try  
`%_extension% MATCHES (?-i)MP3`

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<div class="post-metadata">

**Author:** ![Etz](https://community.mp3tag.de/user_avatar/community.mp3tag.de/etz/32/7648_2.png) [@Etz](https://community.mp3tag.de/u/Etz)\
**Post date:** [March 27, 2021, 12:41pm UTC](https://community.mp3tag.de/t/case-sensitive-filtering/52563/3 "2021-03-27T12:41:41Z")

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> [@ohrenkino](#):
>
> %\_extension% MATCHES (?-i)MP3

Thank you... 🙂

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**Author:** ![system](https://community.mp3tag.de/uploads/default/original/2X/c/ce7035d426cb755a7916793326d23b465222a407.png) [@system](https://community.mp3tag.de/u/system)\
**Post date:** [April 26, 2021, 12:42pm UTC](https://community.mp3tag.de/t/case-sensitive-filtering/52563/4 "2021-04-26T12:42:01Z")

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