# Error while parsing regular expression
**URL:** https://community.mp3tag.de/t/error-while-parsing-regular-expression/13855
**Category:** General Discussion
**Created:** [September 8, 2012, 8:02pm UTC](https://community.mp3tag.de/t/error-while-parsing-regular-expression/13855 "2012-09-08T20:02:55Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@paradajz](https://community.mp3tag.de/u/paradajz)
#### Post date: [September 8, 2012, 8:02pm UTC](https://community.mp3tag.de/t/error-while-parsing-regular-expression/13855/1 "2012-09-08T20:02:55Z")
I want to extract specific part of folder path and apply it as genre.
Example:
D:\Music\Psybient\Albums\Shpongle\2005 - Nothing Lasts But Nothing Is Lost
D:\Music\Psytrance, Goa\Compilations\1999\Psionic Sounds
Notice the genre? All right.
Why doesn't this work?
```
$regexp(%_folderpath%,D:\\\\Music\\\\([\w ,]+)(\\\\)(.*),$1)
```
I get this error:
Invalid preceding regular expression prior to repetition operator. The error occured while parsing the regular expression fragment '\Music(+HERE)()(.)'..mp3
---
### Author:  [@dano](https://community.mp3tag.de/u/dano)
#### Post date: [September 8, 2012, 8:58pm UTC](https://community.mp3tag.de/t/error-while-parsing-regular-expression/13855/2 "2012-09-08T20:58:20Z")
put the expression in single quotes if it contains chars like [ , that have special functions from the scripting language:
$regexp(%\_folderpath%,'D:\\Music\\([\w ,]+)(\\)(.\*)',$1)
---
### Author:  [@JJ\_Johnson](https://community.mp3tag.de/u/JJ_Johnson)
#### Post date: [September 8, 2012, 9:11pm UTC](https://community.mp3tag.de/t/error-while-parsing-regular-expression/13855/3 "2012-09-08T21:11:37Z")
You can simplify that a little, too
$regexp(%\_folderpath%,'D:\\Music\\([^\\]+)\\.\*',$1)
---
### Author:  [@paradajz](https://community.mp3tag.de/u/paradajz)
#### Post date: [September 8, 2012, 9:26pm UTC](https://community.mp3tag.de/t/error-while-parsing-regular-expression/13855/4 "2012-09-08T21:26:36Z")
Thanks and thanks!