Client-Side JS Engine · 0ms Latency · 100% Private
Regex Tester & Debugger
Test, validate, and debug regular expressions in real-time with instant match highlighting and capture group breakdown.
🎯 Common Presets:
/
/
gi
Flags:
0 matches
Real-time DOM render
Match & Capture Groups Details
| # | Full Match | Index Range | Capture Groups |
|---|---|---|---|
| No matches found | |||
Replacement Pattern (supports $1, $2, etc.)
Replaced Result
Regex Cheatsheet & Quick Guide
Character Classes
. - Any character except newline\w - Word character [a-zA-Z0-9_]\d - Digit [0-9]\s - Whitespace (space, tab, newline)[abc] - Any character in set[^abc] - Any character NOT in setQuantifiers & Anchors
^ - Start of string/line$ - End of string/line* - 0 or more times+ - 1 or more times? - 0 or 1 time (optional){n,m} - Between n and m times