Regex Tester
Test and debug regular expressions with live matching and highlighting.
How to Test Regular Expressions Online for Free
1. Type your regex pattern — the sample email pattern loads by default.
2. Toggle flags (global, ignore case, multiline, dot-all) as needed.
3. Enter or paste the test string; matches highlight live.
4. Read the match list for each match position and captured groups.
Regex Testing in Your Browser
Your pattern and test string are evaluated inside your browser. Nothing you type is ever sent to a server.