RegEx Tester & Visual Debugger
Write and test regular expressions with live match highlighting, capture groups, a step-by-step explanation, a cheat sheet, and export to JavaScript, Python, PHP, and Go — all processed locally in your browser.
Frequently asked questions
No. Patterns and sample text stay local. Nothing is sent to LocalTools servers for processing.
The worker enforces limits; simplify patterns if you hit timeout safeguards against ReDoS.