Free Regex Tester — Test Regular Expressions Online

Regex pattern Sample text

How to use

Debug and refine regex before using in code.

Which regex flavor is used?

Python’s re module (PCRE-style). Supports capturing groups, lookahead (in supported Python version), and common patterns.

Can I see capture groups?

Yes. We run the regex and return all matches and their groups so you can debug and refine the pattern.

Is replace supported?

You can test a replacement pattern. We show the result of re.sub (or similar) so you can verify replace behavior.