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.

See the complete tool directory