# Trouble with regular expression
**URL:** https://community.mp3tag.de/t/trouble-with-regular-expression/1508
**Category:** Support
**Created:** [December 6, 2004, 4:19pm UTC](https://community.mp3tag.de/t/trouble-with-regular-expression/1508 "2004-12-06T16:19:16Z")
**Posts on this page:** 7
**Page:** 1
### Author:  [@djRickMitchell](https://community.mp3tag.de/u/djRickMitchell)
#### Post date: [December 6, 2004, 4:19pm UTC](https://community.mp3tag.de/t/trouble-with-regular-expression/1508/1 "2004-12-06T16:19:16Z")
I've used the regular expression given in the forums to take filenames that are all one word (ie: **ThisIsTheFilenameAllOneWord** ) and change it to having spaces before each of the capital letters so it reads: **This Is The Filename All one Word**.
It now doesn't work with 2.26f.
For reference, the expression involves the following two entries:
**1) "/u" is replaced by " $0"
2) "^/s" is replaced by ""**
Please let me know what I need to do to get this working again (or what needs to be done behind the scenes to do so.) I use it on probably a daily basis in restructuring filenames and tags.
As always, thanks for credating MP3 tag ... which is such a great, slick and useful tool for handling what would otherwise be a mundane, time consuming and boring task.
RICK
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### Author:  [@Florian](https://community.mp3tag.de/u/Florian)
#### Post date: [December 6, 2004, 5:59pm UTC](https://community.mp3tag.de/t/trouble-with-regular-expression/1508/2 "2004-12-06T17:59:23Z")
Please have a look at the two images for proper setup of this task.
Best regards,
~ Florian
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### Author:  [@dano](https://community.mp3tag.de/u/dano)
#### Post date: [December 6, 2004, 6:10pm UTC](https://community.mp3tag.de/t/trouble-with-regular-expression/1508/3 "2004-12-06T18:10:12Z")
You must activate case sensitiv comparison!
Took me some time to figure that out...
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### Author:  [@djRickMitchell](https://community.mp3tag.de/u/djRickMitchell)
#### Post date: [December 6, 2004, 6:21pm UTC](https://community.mp3tag.de/t/trouble-with-regular-expression/1508/4 "2004-12-06T18:21:59Z")
In the first panel, you have a pipe symbol at the end of the " $0|". That comes up with a nasty error message. I believe someone else who just posted about the case sensitive setting .. might have the solution to my problem. Will report back.
RICK
> [@](#):
>
> Please have a look at the two images for proper setup of this task.
>
> Best regards,
> ~ Florian
>
> \<{POST\_SNAPBACK}\>
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### Author:  [@Florian](https://community.mp3tag.de/u/Florian)
#### Post date: [December 6, 2004, 6:23pm UTC](https://community.mp3tag.de/t/trouble-with-regular-expression/1508/5 "2004-12-06T18:23:54Z")
> [@](#):
>
> In the first panel, you have a pipe symbol at the end of the " $0|". That comes up with a nasty error message. I believe someone else who just posted about the case sensitive setting .. might have the solution to my problem. Will report back.
>
> RICK
>
> \<{POST\_SNAPBACK}\>
The pipe symbol was my keyboard cursor 😛
Please have a look at the images again. I've updated them about 15 minutes ago.
Best regards,
~ Florian
---
### Author:  [@djRickMitchell](https://community.mp3tag.de/u/djRickMitchell)
#### Post date: [December 6, 2004, 6:27pm UTC](https://community.mp3tag.de/t/trouble-with-regular-expression/1508/6 "2004-12-06T18:27:11Z")
Yes, activating the case sensitive checkmark box has it working fine now.
RICK
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### Author:  [@system](https://community.mp3tag.de/u/system)
#### Post date: [February 9, 2026, 12:19pm UTC](https://community.mp3tag.de/t/trouble-with-regular-expression/1508/7 "2026-02-09T12:19:16Z")