Regex Tester
Test and debug regular expressions in real time. See all matches highlighted, capture groups listed, and get instant feedback on your pattern.
Pattern
//g
Test String
Frequently Asked Questions
Which regex flags are supported?
Global (g), Case-insensitive (i), Multiline (m), and Dotall (s) flags are available as toggles.
Are capture groups shown?
Yes. Each match card lists all numbered and named capture groups along with their matched values.
What happens with an invalid regex?
An inline error message describes exactly what is wrong with the pattern so you can fix it immediately.
Is my data sent to a server?
No. All regex matching runs entirely in your browser using the JavaScript RegExp engine. Nothing leaves your device.