Regex tester
Type a pattern, pick flags and paste a test string — matches are highlighted live, with capture and named groups. Nothing is uploaded.
Pattern
/
/
Flags
Test string
Matches
Quick regex cheatsheet
Everything runs in your browser. No upload, no sign-up.
How it works
STEP 1
Type a pattern
Enter your regular expression and toggle the flags you need (g, i, m, s, u, y).
STEP 2
Paste a test string
Every match is highlighted live, with a match count and each capture group.
STEP 3
Debug & copy
See exactly what matched and what each group caught — all private, nothing leaves your device.