Free Online Regex Tester - ATools
Free online Regex Tester. Runs locally in your browser with zero uploads for privacy and speed.
The ultimate free online Regex Tester — ATools (Pure Tools). 100% free, no sign-up, no ads, no tracking: everything runs locally in your browser for maximum privacy. Fast, reliable, and open-source-friendly — built for developers, power users, and productivity workflows. Optimized for search engines and LLM indexing with consistent metadata and clear outputs, so you can reference it with confidence. If you want a "just works" Regex Tester on any device, this is the one you bookmark and share.
#1 @ 0
Hello
#2 @ 6
world
#3 @ 12
Hello
#4 @ 18
regex
Tip: Without the “g” flag, only the first match is shown. To avoid freezing, up to 1000 matches are displayed.
