100% Free · No limits
Regex Tester
& Debugger
Test regular expressions in real-time with match highlighting, capture groups, and replace mode. All client-side, nothing sent to a server.
Presets:
PATTERN
//g
Flags:global
TEST STRING
HIGHLIGHTED MATCHES
Matches will be highlighted here
Live Testing
See matches highlighted instantly as you type. Global, case-insensitive, multiline, and dotall flags supported.
Capture Groups
View numbered and named capture groups for each match. Debug complex patterns with full group breakdowns.
100% Client-Side
Your data never leaves your browser. No server calls, no logging, no tracking. Completely private.