# Tag - Filename \[Track Number Code\]

**URL:** https://community.mp3tag.de/t/tag-filename-track-number-code/9262
**Category:** Support
**Created:** [November 4, 2009, 2:48pm UTC](https://community.mp3tag.de/t/tag-filename-track-number-code/9262 "2009-11-04T14:48:56Z")
**Posts on this page:** 1
**Showing post:** 9

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### Author: ![dikiz](https://community.mp3tag.de/letter_avatar_proxy/v4/letter/d/5fc32e/32.png) [@dikiz](https://community.mp3tag.de/u/dikiz)
#### Post date: [January 5, 2010, 8:52am UTC](https://community.mp3tag.de/t/tag-filename-track-number-code/9262/9 "2010-01-05T08:52:31Z")

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Well, to make it simpler, what I'd want is already done by the " **Autonumbering Wizard**" button (with "Reset counter for each directory" option ticked).

I just would like to format the tracknumer tag with an action (so it's part my action group, and I don't forget to do it).

Basically i just need to know what is the RegEx formula of the "Autonumbering Wizard" button ?

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_[View the full topic](https://community.mp3tag.de/t/tag-filename-track-number-code/9262)._