# Tool to visualize (and explain) regular expressions?

**URL:** https://community.mp3tag.de/t/tool-to-visualize-and-explain-regular-expressions/62328
**Category:** Support
**Created:** [October 8, 2023, 11:21am UTC](https://community.mp3tag.de/t/tool-to-visualize-and-explain-regular-expressions/62328 "2023-10-08T11:21:17Z")
**Posts on this page:** 1
**Showing post:** 7

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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: [October 9, 2023, 9:04am UTC](https://community.mp3tag.de/t/tool-to-visualize-and-explain-regular-expressions/62328/7 "2023-10-09T09:04:34Z")

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And for those looking for an extended Regexper site that also handles the mentioned `(?i)` flag  
 ![image](https://community.mp3tag.de/uploads/default/original/2X/b/bbb6cc73b6b240286557300956e7a220f17e02c0.png)

and some other specialities like  
named capture groups `^\d(?<groupname>[a-zA-Z])$`

 ![image](https://community.mp3tag.de/uploads/default/original/2X/d/df2b22162ea5d56a724946a78e91fb8d95642360.png)

or  
positive lookbehind assertions `(?<=([abc]))`  
 ![image](https://community.mp3tag.de/uploads/default/original/2X/f/f31b10c7db55274b3052a5adb297377eef2e9482.png)

or  
negative lookbehind assertions `(?<!([abc]))`  
 ![image](https://community.mp3tag.de/uploads/default/original/2X/f/f9cf93d9743b3c507a61d1e32daac7542d2d1fcc.png)

I found this [extended Regexper](https://uzitech.github.io/regexper/) online site (an extended "clone"):

> **[Regexper](https://uzitech.github.io/regexper/)**
>
> Regular expression visualizer using railroad diagrams

Source Code [on Github](https://github.com/UziTech/regexper/)

Just switch to the `PHP` flavour to see the extended possibilities:  
 ![image](https://community.mp3tag.de/uploads/default/original/2X/4/431448670cef3bd059cdd461fe9c097706e371e7.png)

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_[View the full topic](https://community.mp3tag.de/t/tool-to-visualize-and-explain-regular-expressions/62328)._