# \[X\] Character replacement action does not distuingish between lower and upper case characters
**URL:** https://community.mp3tag.de/t/x-character-replacement-action-does-not-distuingish-between-lower-and-upper-case-characters/16893
**Category:** No Bugs
**Created:** [May 8, 2015, 2:03pm UTC](https://community.mp3tag.de/t/x-character-replacement-action-does-not-distuingish-between-lower-and-upper-case-characters/16893 "2015-05-08T14:03:34Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@ChrisBLN](https://community.mp3tag.de/u/ChrisBLN)
#### Post date: [May 8, 2015, 2:03pm UTC](https://community.mp3tag.de/t/x-character-replacement-action-does-not-distuingish-between-lower-and-upper-case-characters/16893/1 "2015-05-08T14:03:34Z")
Here a simple example
I have a song with the filename
> [@](#):
>
> Änderungswünsche.mp3
Note the uppercase "Umlaut" Ä at the beginning and the lower case "Umlaut" ü in the middle.
I have anaction group, which should subistute these Umlaute in the equivalent,
so the upper case Ä should become Ae and the lower case ü should become ue
I found this action group CD-R already with the program.
When i run this action on the song, it renames every Umlaut into lower case:
so the result is:
> [@](#):
>
> aenderungswuensche.mp3
which is wrong!
When i change the order of the actions, so the uppercase actions come before the lower case actions, then the result is:
> [@](#):
>
> AenderungswUensche.mp3
, which is also wrong
Both are wrong!!
So, the conclusion: It seems, that for Mp3tag the lowercase and uppercase characters are identic, even if they have a different unicode, like a look in the CD-R.mta file reveals:
```
[#0]
T=2
F=_FILENAME
1=\u00df
2=ss
3=0
[#1]
T=2
F=_FILENAME
1=\u00e4
2=ae
3=0
[#2]
T=2
F=_FILENAME
1=\u00f6
2=oe
3=0
[#3]
T=2
F=_FILENAME
1=\u00fc
2=ue
3=0
[#4]
T=2
F=_FILENAME
1=\u00c4
2=Ae
3=0
[#5]
T=2
F=_FILENAME
1=\u00d6
2=Oe
3=0
[#6]
T=2
F=_FILENAME
1=\u00dc
2=Ue
3=0
```
I had the same issue already with version 2.69 and the same behavior is also on the TITLE tag, so it does not depend on the fact, that I want to change the filename.
I think this is a bug, or is there a flag anywhere to instruct Mp3tag to distinguish between upper and lower characters?
PS The same problem is with turkish characters as well,
so the lower case unicode-character ç (00e7) and upper case unicode-charakter Ç (00c7) are treated as identic.
Who can help me?
Thanks and best regards along with my compliments for this great software tool!
Chris
---
### Author:  [@DetlevD](https://community.mp3tag.de/u/DetlevD)
#### Post date: [May 8, 2015, 2:12pm UTC](https://community.mp3tag.de/t/x-character-replacement-action-does-not-distuingish-between-lower-and-upper-case-characters/16893/2 "2015-05-08T14:12:39Z")
> [@ChrisBLN](#):
>
> ... It seems, that for Mp3tag the lowercase and uppercase characters are identic, ... ... 3=0 ...
> I think this is a bug, or is there a flag anywhere to instruct Mp3tag to distinguish between upper and lower characters? ...
Because you are familiar with understanding the content of a mta file, ...
please explain for what "3=0" stands for?
DD.20150508.1812.CEST
---
### Author:  [@ChrisBLN](https://community.mp3tag.de/u/ChrisBLN)
#### Post date: [May 8, 2015, 2:20pm UTC](https://community.mp3tag.de/t/x-character-replacement-action-does-not-distuingish-between-lower-and-upper-case-characters/16893/3 "2015-05-08T14:20:52Z")
I found the solution by myself
I have to check the upper/lower case checkbox in the dialog for each single substitution action
or edit the corrisponding .mta script, so to get lines like this:
```
3=0|1
```
before it was
```
3=0
```
Now it works ! 
Thanks for your patience to read this...
---
### Author:  [@Florian](https://community.mp3tag.de/u/Florian)
#### Post date: [December 28, 2018, 2:36pm UTC](https://community.mp3tag.de/t/x-character-replacement-action-does-not-distuingish-between-lower-and-upper-case-characters/16893/4 "2018-12-28T14:36:03Z")
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