# Rename based on certain tag fields incl. regexp

**URL:** https://community.mp3tag.de/t/rename-based-on-certain-tag-fields-incl-regexp/46001
**Category:** Support
**Created:** [July 25, 2019, 8:07am UTC](https://community.mp3tag.de/t/rename-based-on-certain-tag-fields-incl-regexp/46001 "2019-07-25T08:07:17Z")
**Posts on this page:** 1
**Showing post:** 3

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### Author: ![djliakos](https://community.mp3tag.de/letter_avatar_proxy/v4/letter/d/8e8cbc/32.png) [@djliakos](https://community.mp3tag.de/u/djliakos)
#### Post date: [July 25, 2019, 9:32am UTC](https://community.mp3tag.de/t/rename-based-on-certain-tag-fields-incl-regexp/46001/3 "2019-07-25T09:32:03Z")

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> [@Regular Expressions](https://community.mp3tag.de/t/regular-expressions/521/68):
>
> $regexp(%title%,'(._)((._)','$1('%mixartist% '$2')

Thank you so much, it's working. Where can I find more information about regular expression? Syntax etc? Can i save this function?

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