# How Filtering In a Way That Distinguishes Between Uppercase and Lowercase Letters? **URL:** \ **Category:** Support\ **Created:** [October 31, 2026, 4:53pm UTC](https://community.mp3tag.de/t/how-filtering-in-a-way-that-distinguishes-between-uppercase-and-lowercase-letters/72019 "2026-10-31T16:53:42Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![kiwat85029](https://community.mp3tag.de/letter_avatar_proxy/v4/letter/k/45deac/32.png) [@kiwat85029](https://community.mp3tag.de/u/kiwat85029)\ **Post date:** [October 31, 2026, 4:53pm UTC](https://community.mp3tag.de/t/how-filtering-in-a-way-that-distinguishes-between-uppercase-and-lowercase-letters/72019/1 "2026-10-31T16:53:42Z")
Hello everyone, I hope you're all doing well. **First of all:** English is not my native language, and I am very, very, very bad with technology, though I can learn quickly if things are explained well. Please be kind. I would like to perform searches/filtering that are case-sensitive (distinguishing between uppercase and lowercase letters). For example: I want to search my music folder for files that contain the word " **the**" (all lowercase), " **The**" (only the first letter capitalized), or " **THE**" (all uppercase). Is this possible in Mp3tag? Is there a "formula" or expression I can enter into the search/filter field? Thanks in advance, and please, excuse any communication errors I may have made. ---
**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:** [October 31, 2026, 4:57pm UTC](https://community.mp3tag.de/t/how-filtering-in-a-way-that-distinguishes-between-uppercase-and-lowercase-letters/72019/2 "2026-10-31T16:57:04Z")
To filter for all the "The", try Filter: `%title% MATCHES "(?-i)The "` For the "the" try Filter: `%title% MATCHES "(?-i)the "` ---
**Author:** ![kiwat85029](https://community.mp3tag.de/letter_avatar_proxy/v4/letter/k/45deac/32.png) [@kiwat85029](https://community.mp3tag.de/u/kiwat85029)\ **Post date:** [October 31, 2026, 5:46pm UTC](https://community.mp3tag.de/t/how-filtering-in-a-way-that-distinguishes-between-uppercase-and-lowercase-letters/72019/4 "2026-10-31T17:46:38Z")
THANK YOU SO MUCH! It worked very well! I made a few adjustments for my own personal use, and it ended up like this: %title% MATCHES "(?-i) The " %title% MATCHES "(?-i) the " %title% MATCHES "(?-i) THE " If it’s not too much trouble, could you explain this expression to me? I understand the function of _MATCHES_, but what does _(?-i)_ mean? I’d like to learn about it so I can use it in future expressions myself. Thanks in advance! ---
**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:** [October 31, 2026, 5:59pm UTC](https://community.mp3tag.de/t/how-filtering-in-a-way-that-distinguishes-between-uppercase-and-lowercase-letters/72019/5 "2026-10-31T17:59:18Z")
> [@kiwat85029](#): > > could you explain this expression MATCHES behaves like a regular expression. `(?-i)` in regular expressions means: do not ignore case ---
**Author:** ![kiwat85029](https://community.mp3tag.de/letter_avatar_proxy/v4/letter/k/45deac/32.png) [@kiwat85029](https://community.mp3tag.de/u/kiwat85029)\ **Post date:** [October 31, 2026, 6:24pm UTC](https://community.mp3tag.de/t/how-filtering-in-a-way-that-distinguishes-between-uppercase-and-lowercase-letters/72019/7 "2026-10-31T18:24:25Z")
Thank you so so so so so much!!!!! ---
**Author:** ![system](https://community.mp3tag.de/uploads/default/original/2X/c/ce7035d426cb755a7916793326d23b465222a407.png) [@system](https://community.mp3tag.de/u/system)\ **Post date:** [November 2, 2026, 6:24pm UTC](https://community.mp3tag.de/t/how-filtering-in-a-way-that-distinguishes-between-uppercase-and-lowercase-letters/72019/8 "2026-11-02T18:24:29Z")
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