# External variables
**URL:** https://community.mp3tag.de/t/external-variables/54888
**Category:** Support
**Created:** [October 26, 2021, 4:55pm UTC](https://community.mp3tag.de/t/external-variables/54888 "2021-10-26T16:55:29Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@Roland](https://community.mp3tag.de/u/Roland)
#### Post date: [October 26, 2021, 4:55pm UTC](https://community.mp3tag.de/t/external-variables/54888/1 "2021-10-26T16:55:29Z")
how can external (windows) variables like USERNAME be integrated or used in an internal function like "regexpr"?
I want to move some files into certain directories.
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### Author:  [@ohrenkino](https://community.mp3tag.de/u/ohrenkino)
#### Post date: [October 26, 2021, 5:05pm UTC](https://community.mp3tag.de/t/external-variables/54888/2 "2021-10-26T17:05:13Z")
I just used the search function and found this thread:
> [@%\_username% as placeholder](https://community.mp3tag.de/t/username-as-placeholder/40898):
>
> It would be nice to have the ability to write in an export or action the username. For: [https://docs.mp3tag.de/export](https://docs.mp3tag.de/export) e.g. (First line of an export file) $filename(C:\Users\%\_username%\Desktop\filename.txt,utf-8)
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### Author:  [@Roland](https://community.mp3tag.de/u/Roland)
#### Post date: [October 28, 2021, 6:58am UTC](https://community.mp3tag.de/t/external-variables/54888/3 "2021-10-28T06:58:30Z")
Thank U ohrenkino.
This thread helps me a lot. 😉
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### Author:  [@system](https://community.mp3tag.de/u/system)
#### Post date: [March 1, 2025, 7:49am UTC](https://community.mp3tag.de/t/external-variables/54888/4 "2025-03-01T07:49:28Z")
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