What does RegexLab do?
RegexLab is a free online regex tester built around real analytics work: testing Google Analytics 4 page path, event and filter regex before pasting them into GA4. It runs entirely client-side, so no data ever leaves your device, and needs no login. GA4 uses full-match semantics and the RE2 engine (no lookahead or backreferences), which is why most regexes that work elsewhere silently return zero rows in GA4 — RegexLab ships with reference guides covering GA4 patterns, page path regex, event filter recipes and an RE2 vs PCRE migration reference.
Who should use RegexLab?
Developers, digital marketers., GA4 analysts are the clearest fit based on how the product is positioned.
Best fit
Pricing: Free
Platforms: Web
How much does RegexLab cost?
Free Check the provider’s own page for the latest pricing, packages and terms.
Details, pricing and availability can change. We use provider information, verified owner updates and editorial review where available. Check the provider’s own page before making a purchase, booking or important decision.
Profile last updated 21 Oct 2026.
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