# Action- Filename - Lower case except very first letter
**URL:** https://community.mp3tag.de/t/action-filename-lower-case-except-very-first-letter/12236
**Category:** Support
**Created:** [July 6, 2011, 6:38am UTC](https://community.mp3tag.de/t/action-filename-lower-case-except-very-first-letter/12236 "2011-07-06T06:38:17Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@RussellRay](https://community.mp3tag.de/u/RussellRay)
#### Post date: [July 6, 2011, 6:38am UTC](https://community.mp3tag.de/t/action-filename-lower-case-except-very-first-letter/12236/1 "2011-07-06T06:38:17Z")
Hello all
Can someone help me out please with an action to apply to the FILENAME only ?
My directory tree is
E: \ Music \ Genre \ Artist \ Year Album \
and then comes the filename comprising :
Tracknumber (2 or 3 digits) SPACE Trackname.
Many tracknames are mixed case, i.e. each word starting in uppercase.
Example
01 Smoke On The Water
I want to change this to :
01 Smoke on the water
If I create an action FILENAME Sentence case, all letters including the very first go lowercase.
01 smoke on the water
I have entered 0123456789 and a space in the AFTER box
but this makes no difference.
What am I doing wrong ?
Best regards and thanks in advance
Ray
---
### Author:  [@DetlevD](https://community.mp3tag.de/u/DetlevD)
#### Post date: [July 6, 2011, 8:12am UTC](https://community.mp3tag.de/t/action-filename-lower-case-except-very-first-letter/12236/2 "2011-07-06T08:12:19Z")
> [@RussellRay](#):
>
> ... filename ... Tracknumber (2 or 3 digits) SPACE Trackname.
> Many tracknames are mixed case, i.e. each word starting in uppercase.
> Example
> 01 Smoke On The Water
> I want to change this to :
> 01 Smoke on the water
> If I create an action FILENAME Sentence case, all letters including the very first go lowercase.
> 01 smoke on the water
> I have entered 0123456789 and a space in the AFTER box
> but this makes no difference. ...
The action module works correct.
But it cannot help to solve the task, I think so.
There are other ways to go in Mp3tag, here is one proposal ...
(... for two digit leading track number)
Action: Format value
Field: \_FILENAME
Formatstring: **$left(%\_filename%,3)$caps3($cutLeft(%\_filename%,3))**
Here is another proposal, which handles a various number of leading digits ...
Action: Format value
Field: \_FILENAME
Formatstring: **$regexp(%\_filename%,'^(\d+\s+)(.)(.+)$','$1\u$2\L$3')**
From:
01 Smoke On The Water
To:
01 Smoke on the water
DD.20110706.1222.CEST
---
### Author:  [@RussellRay](https://community.mp3tag.de/u/RussellRay)
#### Post date: [July 8, 2011, 6:59am UTC](https://community.mp3tag.de/t/action-filename-lower-case-except-very-first-letter/12236/3 "2011-07-08T06:59:11Z")
From:
01 Smoke On The Water
To:
01 Smoke on the water
vielen Dank - ich habe die zweite Variante verwendet - funktioniert perfekt !
Ray
---
### Author:  [@system](https://community.mp3tag.de/u/system)
#### Post date: [February 9, 2026, 12:23pm UTC](https://community.mp3tag.de/t/action-filename-lower-case-except-very-first-letter/12236/4 "2026-02-09T12:23:12Z")