Regex Tester & Debugger
Test regular expressions in real time. Highlights all matches, shows capture groups, and supports replace mode — all in your browser.
✓ Live Matching✓ Capture Groups✓ Replace Mode✓ Common Patterns
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Test String
Matches
Run a pattern to see matches here.
Replace:
Quick Reference
.Any char except newline\dDigit [0-9]\wWord char [a-zA-Z0-9_]\sWhitespace^Start of string$End of string*0 or more+1 or more?0 or 1 (optional){n,m}Between n and m times[abc]Character class(a|b)Alternation(?:…)Non-capturing group(?=…)Positive lookahead\bWord boundary$1 $2Back-references