# $regexp(%TITLE%,\[^0-9a-zA-Z\],) does not work

**URL:** https://community.mp3tag.de/t/regexp-title-0-9a-za-z-does-not-work/56445
**Category:** Mac
**Created:** [February 23, 2022, 11:02am UTC](https://community.mp3tag.de/t/regexp-title-0-9a-za-z-does-not-work/56445 "2022-02-23T11:02:33Z")
**Posts on this page:** 1
**Showing post:** 2

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### Author: ![LyricsLover](https://community.mp3tag.de/letter_avatar_proxy/v4/letter/l/c6cbf5/32.png) [@LyricsLover](https://community.mp3tag.de/u/LyricsLover)
#### Post date: [February 23, 2022, 11:21am UTC](https://community.mp3tag.de/t/regexp-title-0-9a-za-z-does-not-work/56445/2 "2022-02-23T11:21:24Z")

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If I try it with the Convert Tag -\> Tag (to see the result in the preview - green box) I don't see any error:

![image](https://community.mp3tag.de/uploads/default/original/2X/4/459701041149d126064b777816d79d3ae0e18270.png)

Could you please show us with a [screenshot](https://community.mp3tag.de/t/hints-for-asking-support-requests/56190#use-screenshots-to-exemplify-the-issue-2) where do you get the "invalid regular expression" error message?

BTW:  
The regular expression itself should be something like  
`$regexp(%TITLE%,'[^0-9a-zA-Z]', )`  
to get  
 ![image](https://community.mp3tag.de/uploads/default/original/2X/3/3f7056ffd26f82d11526f1de8e4f215b5f4890b4.png)

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