# Track Filename Conversion
**URL:** https://community.mp3tag.de/t/track-filename-conversion/5004
**Category:** Support
**Created:** [June 12, 2007, 9:33pm UTC](https://community.mp3tag.de/t/track-filename-conversion/5004 "2007-06-12T21:33:59Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@KOTEKNIK](https://community.mp3tag.de/u/KOTEKNIK)
#### Post date: [June 12, 2007, 9:33pm UTC](https://community.mp3tag.de/t/track-filename-conversion/5004/1 "2007-06-12T21:33:59Z")
Hi
I've got a little problem with MP3TAG v2.38
I would like to have a track filename like: Artist - Title (Feat.**).mp3**
Problem is that my track filename is like that: Artist - Title Feat."leading space".mp3 and without the () "Parenthèse??" aren't present at the beginning and at the end of the Featuring...ggrr 
After reading the FAQ and trying by myself i didn't succed yet...
There my "New Action":
Action type: **Replace with regular expressions**
Field: **\_FILENAME**
Regular expression: **^Feat.\s+$**
Replace matches with: **(Feat.($1))**
And is there a FAQ that explain every % $ \s $num ,etc... signification step by step in order to do learn and do a personnalized script?
Thanks a lot for your help & sorry for my poor english i did my best 😉
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### Author:  [@LyricsLover](https://community.mp3tag.de/u/LyricsLover)
#### Post date: [June 13, 2007, 2:24pm UTC](https://community.mp3tag.de/t/track-filename-conversion/5004/2 "2007-06-13T14:24:46Z")
One solution could be:
Regular Expression: (Feat.)(.\*)(.mp3)
Replace matches with: ($1$2)$3
I'm sure, this is not the best possible solution, but you can change it as you like. 😉
As always: Don't try it on your original mp3. Make some backup first. 
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### Author:  [@KOTEKNIK](https://community.mp3tag.de/u/KOTEKNIK)
#### Post date: [June 13, 2007, 8:50pm UTC](https://community.mp3tag.de/t/track-filename-conversion/5004/3 "2007-06-13T20:50:44Z")
Thank you for your fast answer!
Regular Expression: (Feat.)(.\*)(.mp3)
Replace matches with: ($1$2)$3
It works but it's a bit slow in mass rename because as the action change/replace the extension .mp3 by the same .mp3 on the filename, it seems that it's makes the operation more longer than a modification on tags only! But perhaps i'm wrong 😛
So i did that and the file file keep almost the .mp3 extension:
Regular Expression: (Feat.)(.+)[^mp3]
Replace matches with: ($1$2).
But it strange because i was forced to keep the **dot** in the "replace matches line" because if not the action delete the last character or number **before**** \***.mp3 and don't include it in the parenthese
Do somebody help me to resolve this? 
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### Author:  [@system](https://community.mp3tag.de/u/system)
#### Post date: [February 9, 2026, 12:20pm UTC](https://community.mp3tag.de/t/track-filename-conversion/5004/4 "2026-02-09T12:20:20Z")