# \[F\] False duplicate detection in loop limit
**URL:** https://community.mp3tag.de/t/f-false-duplicate-detection-in-loop-limit/15609
**Category:** Fixed Bugs
**Tags:** bug-fixed
**Created:** [March 23, 2014, 12:03am UTC](https://community.mp3tag.de/t/f-false-duplicate-detection-in-loop-limit/15609 "2014-03-23T00:03:00Z")
**Posts on this page:** 6
**Page:** 1
### Author:  [@chrisjj](https://community.mp3tag.de/u/chrisjj)
#### Post date: [March 23, 2014, 12:03am UTC](https://community.mp3tag.de/t/f-false-duplicate-detection-in-loop-limit/15609/1 "2014-03-23T00:03:00Z")
Help [https://docs.mp3tag.de/export](https://docs.mp3tag.de/export) says:
> [@](#):
>
> If you want to limit the loop output to a certain number of entries, simply use $loop(%fieldname%,num). This is useful to eliminate duplicate records (num=1).
yet here only one of the two (non-duplicate) titles gets output:
ISTM program is comparing case-insensitively and either the program or the Help ("duplicate") is incorrect.
If anyone knows a workaround, please say.
---
### Author:  [@DetlevD](https://community.mp3tag.de/u/DetlevD)
#### Post date: [March 23, 2014, 7:51am UTC](https://community.mp3tag.de/t/f-false-duplicate-detection-in-loop-limit/15609/2 "2014-03-23T07:51:06Z")
> [@chrisjj](#):
>
> ... ISTM program is comparing case-insensitively and either the program or the Help ("duplicate") is incorrect.
> If anyone knows a workaround, please say.
There is a workaround which can detect differences in lower / upper case, ...
but cannot handle diacritics.
\_\_Export.loop.case.respect.mte ( 845bytes ) Number of downloads: 1
[\_\_Export.loop.case.respect.mte](https://community.mp3tag.de/uploads/default/original/2X/7/7df3b2db5f3bc3b60f984a7cdbc144e39a1c4d5d.mte) (1.15 KB)
DD.20140323.0953.CET
[\_\_Export.loop.case.respect.mte](https://community.mp3tag.de/uploads/default/original/2X/7/7df3b2db5f3bc3b60f984a7cdbc144e39a1c4d5d.mte) (1.15 KB)
---
### Author:  [@chrisjj](https://community.mp3tag.de/u/chrisjj)
#### Post date: [March 23, 2014, 9:31pm UTC](https://community.mp3tag.de/t/f-false-duplicate-detection-in-loop-limit/15609/3 "2014-03-23T21:31:47Z")
> [@DetlevD](#):
>
> There is a workaround which can detect differences in lower / upper case, ...
> but cannot differentiate diacritics.
>
> \_\_Export.loop.case.respect.mte ( 845bytes ) Number of downloads: 1
Thanks, D. In my sample script given, I replaced
```
$loop(%title%,1)
```
with your
```
$loop(%TITLE%$regexp($regexp(%TITLE%,'\l','0'),'\u','1'),1)
```
and that gave case-insensitivity as I required.
Re diacritics, my full script is is intended to output a playlist containing all tracks showing deviation in title, e.g. having title differing from that of any track in presence/absence of (Spanish) diacritics or any character other than letters or digits, or letter case. With your case fix, that script is now:
```
#EXTM3U
$loop($regexp($replace($lower(%title%),á,a,é,e,í,i,ó,o,ú,u,n,ñ),'[^a-zA-Z0-9]',))$loop(%TITLE%$regexp($regexp(%TITLE%,'\l','0'),'\u','1'),1)$loopend()$ifgreater(%_max_counter%,1,$loop(%title%)#EXTINF:%_lentgh%,%artist% - %title%
%_path%
$loopend()
,)$loopend()
```
From this list of titles
```
A bailar
A bailar
Adios muchachos
Adios, muchachos
Chique
Chiqué
La Cumparsita
La cumparsita
Vida Mía
Vida mía
```
it puts these in a EXTM3U playlist
```
Adios muchachos
Adios, muchachos
Chique
Chiqué
La Cumparsita
La cumparsita
Vida Mía
Vida mía
```
.
I then load the playlist into Mp3tag for manual correction of the faulty titles.
---
### Author:  [@Florian](https://community.mp3tag.de/u/Florian)
#### Post date: [April 20, 2014, 8:27am UTC](https://community.mp3tag.de/t/f-false-duplicate-detection-in-loop-limit/15609/4 "2014-04-20T08:27:46Z")
I've fixed this with Mp3tag v2.59.
```
[2014-04-13] FIX: export field parameter at $loop() was compared case-insensitive which caused unexpected behavior at duplicate detection.
```
Thanks for reporting!
Kind regards
Florian
---
### Author:  [@chrisjj](https://community.mp3tag.de/u/chrisjj)
#### Post date: [April 22, 2014, 11:07pm UTC](https://community.mp3tag.de/t/f-false-duplicate-detection-in-loop-limit/15609/5 "2014-04-22T23:07:51Z")
Thanks.
FTR, this makes V2.59 incompatible with previous versions when performing some export configs.
---
### Author:  [@Florian](https://community.mp3tag.de/u/Florian)
#### Post date: [December 28, 2018, 2:06pm UTC](https://community.mp3tag.de/t/f-false-duplicate-detection-in-loop-limit/15609/6 "2018-12-28T14:06:59Z")
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