Regex Tester
See a regex match highlighted live instead of guessing why a pattern failed.
Debugging a regex pattern with existing tools meant no real-time visual feedback on what was actually matching.
A public deployment is available to try.
Case Study
Before
Existing regex tools were either desktop-only or lacked real-time visual feedback, making it hard to understand complex patterns and debug matches quickly.
After
Delivered a fast, accessible regex debugging tool that handles complex patterns without UI lag. Used by developers for quick pattern validation without leaving the browser.
How it's solved
Built a browser-based regex tester with instant match highlighting, group capture visualization, and a library of common patterns. Implemented Web Workers for non-blocking pattern execution to prevent UI freezing on complex expressions.
Trade-offs
Web Workers prevent UI freezing, but catastrophic backtracking in a pathological pattern can still take a long time to resolve.
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