Enter text and a regex pattern (without slashes). Results update in real-time.
Use presets for Email, Phone, URL, IP, Chinese characters. Toggle Global, Ignore Case, Multiline.
Yes, completely free. No registration, no download required. Everything runs locally in your browser.
Absolutely not. This is a purely client-side application. All processing happens locally in your browser β your data never leaves your device.
Per Mastering Regular Expressions (Friedl): Avoid catastrophic backtracking (nested quantifiers), use non-greedy matching, pre-compile regex objects, and use character classes instead of alternations to significantly improve match performance.