# guessing track number
**URL:** https://community.mp3tag.de/t/guessing-track-number/1669
**Category:** Support
**Created:** [February 2, 2005, 2:57am UTC](https://community.mp3tag.de/t/guessing-track-number/1669 "2005-02-02T02:57:59Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@kmare](https://community.mp3tag.de/u/kmare)
#### Post date: [February 2, 2005, 2:57am UTC](https://community.mp3tag.de/t/guessing-track-number/1669/1 "2005-02-02T02:57:59Z")
Anyone have a recommendation on how to fill track numbers within the tag? I have filesnames that are in a variety of formats ie:
##-artist-title
artist-##-title
etc.
Is there a clean way to filter the filename down to a number and paste that into the mp3tag?
I was thinking of filtering files by 01,02,03 etc and manually tagging each group -- should be an easier way though 
---
### Author:  [@Fux](https://community.mp3tag.de/u/Fux)
#### Post date: [February 2, 2005, 9:13am UTC](https://community.mp3tag.de/t/guessing-track-number/1669/2 "2005-02-02T09:13:02Z")
I am right? You only want the tracknumber from your filename into your tag?
Only for filenames with track inside:
1.: Format field TRACK with %\_filename%
2.: A Regular Expression with field TRACK:
```
.*-\s?(\d+)\s?-.*|^(\d+)\s?-.* substitute with $1$2
```
Regards
Fux
---
### Author:  [@system](https://community.mp3tag.de/u/system)
#### Post date: [February 9, 2026, 12:19pm UTC](https://community.mp3tag.de/t/guessing-track-number/1669/3 "2026-02-09T12:19:19Z")