# Regexp help

**URL:** https://community.mp3tag.de/t/regexp-help/14416
**Category:** Support
**Created:** [February 1, 2013, 4:05am UTC](https://community.mp3tag.de/t/regexp-help/14416 "2013-02-01T04:05:54Z")
**Posts on this page:** 1
**Showing post:** 5

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### Author: ![Oblio](https://community.mp3tag.de/user_avatar/community.mp3tag.de/oblio/32/4828_2.png) [@Oblio](https://community.mp3tag.de/u/Oblio)
#### Post date: [February 19, 2013, 12:09am UTC](https://community.mp3tag.de/t/regexp-help/14416/5 "2013-02-19T00:09:58Z")

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OK thanks. Thanks also for the little tricks DetlevD. You seem to have a lot of tricks up your sleeve!

So for filter matching literal right round bracket: _surround whole expression in double quotes._

But in this example by pone each literal round bracket is surrounded by single quotes:

[Add parentheses To featured artist](https://community.mp3tag.de/t/10701/5)

Why is this necessary? Just trying to understand.

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_[View the full topic](https://community.mp3tag.de/t/regexp-help/14416)._