# Regex or commands for Filtering, Finding

**URL:** https://community.mp3tag.de/t/regex-or-commands-for-filtering-finding/68565
**Category:** Support
**Created:** [May 21, 2025, 10:30am UTC](https://community.mp3tag.de/t/regex-or-commands-for-filtering-finding/68565 "2025-05-21T10:30:37Z")
**Posts on this page:** 1
**Showing post:** 2

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### Author: ![LyricsLover](https://community.mp3tag.de/letter_avatar_proxy/v4/letter/l/c6cbf5/32.png) [@LyricsLover](https://community.mp3tag.de/u/LyricsLover)
#### Post date: [May 21, 2025, 10:41am UTC](https://community.mp3tag.de/t/regex-or-commands-for-filtering-finding/68565/2 "2025-05-21T10:41:38Z")

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You can use expressions mentioned here:

> [@Filter expressions](https://community.mp3tag.de/t/filter-expressions/10080/4):
>
> Filter with Regular Expression (Regex) Track numbers that have number/number syntax track MATCHES \d\/\d Filenames that start with two digits: %\_filename% MATCHES ^\d\d Filenames that start with two digits not followed by another digit: %\_filename% MATCHES ^\d\d\D Case sensitive filter: title MATCHES (?-i)regex Files with characters that are not in ISO-8859-1 in tag or filename \* MATCHES [\x{0100}-\x{FFFF}]

For example to filter case sensitive in `_FILENAME`:  
`%_FILENAME% MATCHES (?-i)dog`  
`%_FILENAME% MATCHES (?-i)DOG`

For your special characters like **Ç** or **ç** you could also use the syntax `\x{0123}` - where you have to use the correct value for the characters:  
`%_FILENAME% MATCHES (?-i)\x{00C7}` -\> Ç  
`%_FILENAME% MATCHES (?-i)\x{00E7}` -\> ç

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