DEVELOPER UTILITY
Regex Tester
Test JavaScript regular expressions in a bounded Web Worker. Runs beyond the fixed deadline stop and are marked incomplete.
Example inputs
- Match consecutive a characters
a+ baaa
Everything is processed only in this browser.
How it works
Test JavaScript regular expressions inside a bounded Worker.
Frequently asked questions
Can a regex freeze the page?
Tests run in a bounded Worker and stop after 250 ms.
Does a timeout mean no match?
No. A timeout is explicitly marked incomplete.