# Regular Expressions

**URL:** https://community.mp3tag.de/t/regular-expressions/521
**Category:** Howto
**Created:** [October 16, 2003, 4:47pm UTC](https://community.mp3tag.de/t/regular-expressions/521 "2003-10-16T16:47:29Z")
**Posts on this page:** 1
**Showing post:** 69

<div class="post-metadata">

### Author: ![movtar](https://community.mp3tag.de/letter_avatar_proxy/v4/letter/m/53a042/32.png) [@movtar](https://community.mp3tag.de/u/movtar)
#### Post date: [August 17, 2019, 3:52am UTC](https://community.mp3tag.de/t/regular-expressions/521/69 "2019-08-17T03:52:45Z")

</div>

Fixing/Renaming files with invalid(invisible) characters.

I came across some MP3's with invisible characters (like Ø ) in their name because of some codepage hickups. It's quite easy to fix with a simple regex search and replace.

Actions -\> Replace with regular expression  
Field: \_ALL  
regex: \xc3\x98  
Replace matches with: Ø

\xc3 = hex c3 = Ã  
\x98 = hex 98 = invisible control character (on my PC)

A full list with possible hickups can be found here:  
[UTF-8 Encoding Debugging Chart](https://www.i18nqa.com/debug/utf8-debug.html#dbg)

 ![RegExFix](https://community.mp3tag.de/uploads/default/original/2X/8/8de5dd98a15d02b9480f4acd9af4cdd2cf53a1de.png)

---

_[View the full topic](https://community.mp3tag.de/t/regular-expressions/521)._