Online Regex Tester
Test regular expressions with live match highlighting and flag controls. Supports JavaScript regex syntax.
/ /
Results will appear here...
No matches yet.
About this Regex Tester
Genbox's regex tester runs entirely in your browser — no data is sent to any server. It uses the native JavaScript RegExp engine, making it perfect for testing patterns you'll use in Node.js, browser JavaScript, or TypeScript projects.
Supported Flags
| Flag | Name | Effect |
|---|---|---|
g | global | Find all matches, not just the first |
i | ignoreCase | Match regardless of letter case |
m | multiline | ^ and $ match line boundaries |
s | dotAll | . matches newlines |
u | unicode | Full Unicode support |
Want to learn more about regex? Read our complete regex cheat sheet.