About TestRegex

TestRegex is built with a single mission: to make Regular Expressions understandable, accessible, and debuggable for everyone, from beginners to seasoned engineers.

Why We Built This

Regular Expressions are powerful but notoriously difficult to master. Existing tools often lack support for modern Regex features (like Lookbehinds in JS or recursive patterns in PCRE) or fail to explain why a pattern matches.

We wanted a tool that didn't just tell you if it matches, but explained the underlying logic visually.

Technical Philosophy

This tool is built on modern web standards:

• Privacy First: regexes runs entirely in your browser. We don't store your patterns unless you explicitly share them.
• Performance: Built with Svelte for zero-latency interactions.
• Accuracy: We use the actual browser regex engine (or strict emulations) to ensure 100% compliance with your target environment.

Community

We believe in the power of a community working together. If you find a bug or have a feature request, please send a message to the developer!