# Filter expressions
**URL:** https://community.mp3tag.de/t/filter-expressions/10080
**Category:** Howto
**Created:** [March 11, 2010, 5:37pm UTC](https://community.mp3tag.de/t/filter-expressions/10080 "2010-03-11T17:37:11Z")
**Posts on this page:** 8
**Page:** 1
### Author:  [@dano](https://community.mp3tag.de/u/dano)
#### Post date: [March 11, 2010, 5:37pm UTC](https://community.mp3tag.de/t/filter-expressions/10080/1 "2010-03-11T17:37:11Z")
## This topic collects useful Filter expressions
If you have a useful filter expression, please post it here and give a **short description** of what it does.
These filter expressions can be used with the Mp3tag filter [F3].
Please look at [https://docs.mp3tag.de/filter](https://docs.mp3tag.de/filter) for the documentation.
**Notes**
- All filter keywords must be uppercase.
- All operations are case insensitive, for a workaround see [this post](https://community.mp3tag.de/t/10080/4).
---
### Author:  [@dano](https://community.mp3tag.de/u/dano)
#### Post date: [March 11, 2010, 5:38pm UTC](https://community.mp3tag.de/t/filter-expressions/10080/2 "2010-03-11T17:38:10Z")
### Simple filter
**All files without tags:**
`%_tag% IS ""`
**Files with flac and ID3v2 tags:**
`%_tag% HAS "flac id3v2"`
**Files with mp4 extension**
`%_extension% IS mp4`
**All files with a bitrate over 180**
`%_bitrate% GREATER 180`
**All files with embedded covers over 20 kbyte**
`%_cover_size% GREATER 20480`
---
### Author:  [@dano](https://community.mp3tag.de/u/dano)
#### Post date: [March 11, 2010, 5:38pm UTC](https://community.mp3tag.de/t/filter-expressions/10080/3 "2010-03-11T17:38:57Z")
### Filter with Scripting
**Check if a field is longer than 4 characters:**
`"$len(%bpm%)" GREATER 4`
**Files with multipe artist tags:**
`"$meta_sep(Artist,\\)" HAS \\`
**Check if two fields have the same value:**
`"$if($eql(%artist%,%albumartist%),yes,no)" IS yes`
**Check if the title is part of the filename:**
`"$ifgreater($strstr(%_filename%,%title%),0,yes,no)" IS yes`
---
### Author:  [@dano](https://community.mp3tag.de/u/dano)
#### Post date: [March 16, 2010, 7:10pm UTC](https://community.mp3tag.de/t/filter-expressions/10080/4 "2010-03-16T19:10:57Z")
### 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}]`
---
### Author:  [@dano](https://community.mp3tag.de/u/dano)
#### Post date: [December 6, 2010, 9:24am UTC](https://community.mp3tag.de/t/filter-expressions/10080/5 "2010-12-06T09:24:12Z")
**Filenames with 2 hyphens**
`"$len($regexp(%_filename%,'[^-]',))" IS 2`
**Filenames with at least 2 hyphens**
`"$len($regexp(%_filename%,'[^-]',))" GREATER 1`
**Track number is a single digit**
`track MATCHES ^\d$`
**Title tag starts with four capital letters**
`"$if($eql($regexp(%title%,^\u\u\u\u,),%title%),yes,no)" IS no`
---
### Author:  [@ohrenkino](https://community.mp3tag.de/u/ohrenkino)
#### Post date: [May 10, 2023, 5:19am UTC](https://community.mp3tag.de/t/filter-expressions/10080/6 "2023-05-10T05:19:57Z")
A post was split to a new topic: [Filter not working as expected](https://community.mp3tag.de/t/filter-not-working-as-expected/60928)
---
### Author:  [@ohrenkino](https://community.mp3tag.de/u/ohrenkino)
#### Post date: [June 20, 2024, 1:05pm UTC](https://community.mp3tag.de/t/filter-expressions/10080/7 "2024-06-20T13:05:34Z")
A post was split to a new topic: [Filter for capitals does not work](https://community.mp3tag.de/t/filter-for-capitals-does-not-work/65093)
---
### Author:  [@Florian](https://community.mp3tag.de/u/Florian)
#### Post date: [June 20, 2024, 2:11pm UTC](https://community.mp3tag.de/t/filter-expressions/10080/8 "2024-06-20T14:11:03Z")