# Find all .MP3 extensions and replace with .mp3

**URL:** <https://community.mp3tag.de/t/find-all-mp3-extensions-and-replace-with-mp3/52830>\
**Category:** Support\
**Created:** [April 14, 2021, 3:40pm UTC](https://community.mp3tag.de/t/find-all-mp3-extensions-and-replace-with-mp3/52830 "2021-04-14T15:40:08Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![AdanS](https://community.mp3tag.de/letter_avatar_proxy/v4/letter/a/8491ac/32.png) [@AdanS](https://community.mp3tag.de/u/AdanS)\
**Post date:** [April 14, 2021, 3:40pm UTC](https://community.mp3tag.de/t/find-all-mp3-extensions-and-replace-with-mp3/52830/1 "2021-04-14T15:40:08Z")

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Hello... I am a sort of newbie, and need help to find all the tracks that have a capitalized extension, so I can change it to lower case.

Many thanks in advance

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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:** [April 14, 2021, 3:46pm UTC](https://community.mp3tag.de/t/find-all-mp3-extensions-and-replace-with-mp3/52830/2 "2021-04-14T15:46:37Z")

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Try this filter:  
`%_extension% MATCHES (?-i)MP3`

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<div class="post-metadata">

**Author:** ![AdanS](https://community.mp3tag.de/letter_avatar_proxy/v4/letter/a/8491ac/32.png) [@AdanS](https://community.mp3tag.de/u/AdanS)\
**Post date:** [April 14, 2021, 5:58pm UTC](https://community.mp3tag.de/t/find-all-mp3-extensions-and-replace-with-mp3/52830/3 "2021-04-14T17:58:25Z")

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You're a star, thank you very much!

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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:** [May 14, 2021, 5:58pm UTC](https://community.mp3tag.de/t/find-all-mp3-extensions-and-replace-with-mp3/52830/4 "2021-05-14T17:58:31Z")

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