# Looking for a Regex testing website (or tool) supporting the "\\u" class

**URL:** <https://community.mp3tag.de/t/looking-for-a-regex-testing-website-or-tool-supporting-the-u-class/18498>\
**Category:** Off-Topic\
**Created:** [December 8, 2016, 1:44am UTC](https://community.mp3tag.de/t/looking-for-a-regex-testing-website-or-tool-supporting-the-u-class/18498 "2016-12-08T01:44:47Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![malganis](https://community.mp3tag.de/letter_avatar_proxy/v4/letter/m/8dc957/32.png) [@malganis](https://community.mp3tag.de/u/malganis)\
**Post date:** [December 8, 2016, 1:44am UTC](https://community.mp3tag.de/t/looking-for-a-regex-testing-website-or-tool-supporting-the-u-class/18498/1 "2016-12-08T01:44:47Z")

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I have installed [Regex Match Tracer](http://www.regex-match-tracer.com) but i can't figure out how greedy repeats work with the uppercase class. I have also googled for online regex testers unable to find one that would recognize it as uppercase instead of syntax error or literal character "u". Does anyone know of a program or online source where this class is still valid so i can test my regular expressions?

Thank you in advance!

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**Author:** ![ohrenkino](https://community.mp3tag.de/user_avatar/community.mp3tag.de/ohrenkino/32/4843_2.png) [@ohrenkino](https://community.mp3tag.de/u/ohrenkino)\
**Post date:** [December 16, 2016, 5:56am UTC](https://community.mp3tag.de/t/looking-for-a-regex-testing-website-or-tool-supporting-the-u-class/18498/2 "2016-12-16T05:56:48Z")

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MP3tag has some testing abilities in the shape of the function  
Convert\>Tag-Tag  
if you enter as format string a $regexp() expression.