Markdown Editor
Write Markdown and see it as you type, with GitHub alerts, tables, tasks, math, Mermaid and PlantUML.
Regex Tester
Write a regular expression, see what it matches, read it in plain words and take it to your code: JavaScript, .NET and more.
Flavor
Test text
Every part of the pattern in plain words. Hover a line to light it in the pattern and in the text.
Replace with
Tests are saved with the pattern.
Each flavor is the real engine, built for the browser from its own source, loaded from this site only when you pick it and kept by your browser after that. A share link carries the pattern, the flavor and the options.
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