diff --git a/README.md b/README.md
index d59b8e8b..d9dc4f24 100644
--- a/README.md
+++ b/README.md
@@ -237,6 +237,7 @@ When learning CS, there are some useful sites you must know to get always inform
 - [Diagrams.net](https://app.diagrams.net/) : Drawing tools to make design and uml easily. Old draw.io
 - [FreeFor.Dev](https://free-for.dev/#/) : A huge list of free resources and tools
 - [Kody Tools](https://www.kodytools.com/dev-tools): 100+ dev tools including code converters, formatters, and minifiers.
+- [Pyrexp](https://pythonium.net/regex) : Online regex tester and visualizer for Python.
 - [regex101](https://regex101.com) : Online regex tester and debugger: PHP, PCRE, Python, Golang and JavaScript
 - [regexr](https://regexr.com) : Another online tool to learn, build & test Regular Expressions
 - [Prodia AI Image API](https://prodia.com/) : API for open sourced image models