# 01title to 01.title
**URL:** https://community.mp3tag.de/t/01title-to-01-title/6082
**Category:** Support
**Created:** [January 17, 2008, 2:15am UTC](https://community.mp3tag.de/t/01title-to-01-title/6082 "2008-01-17T02:15:08Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@chtchan](https://community.mp3tag.de/u/chtchan)
#### Post date: [January 17, 2008, 2:15am UTC](https://community.mp3tag.de/t/01title-to-01-title/6082/1 "2008-01-17T02:15:08Z")
As said in title, I have filenames that are TrackTitle, I would like to change to Track.Title.
I have tried this method but without success, please tell me how I can do it.
I have tried doing:
Action:Replace with regular expression
Field:\_Filename
Regular Expression:^\d{0,2}
Replace matches with:$1.
---
### Author:  [@dano](https://community.mp3tag.de/u/dano)
#### Post date: [January 17, 2008, 10:43am UTC](https://community.mp3tag.de/t/01title-to-01-title/6082/2 "2008-01-17T10:43:45Z")
You need parentheses to make $1 work:
Regular Expression:^(\d{1,2})
Replace matches with:$1.
---
### Author:  [@chtchan](https://community.mp3tag.de/u/chtchan)
#### Post date: [January 18, 2008, 5:00pm UTC](https://community.mp3tag.de/t/01title-to-01-title/6082/3 "2008-01-18T17:00:13Z")
ah thank you!
---
### Author:  [@system](https://community.mp3tag.de/u/system)
#### Post date: [February 9, 2026, 12:20pm UTC](https://community.mp3tag.de/t/01title-to-01-title/6082/4 "2026-02-09T12:20:43Z")