RegexLens

RegexLens is a web-based regex debugger that visualizes pattern matching in real time. You write a regex, paste in test strings, and see matches, captures, and groups highlighted as you type. Saved patterns are backed by PostgreSQL so you can build and revisit a library of tested expressions. Built with Next.js 16, TypeScript 5.7 in strict mode, and React 19, with Vitest for unit tests and Playwright for end-to-end coverage.