Regex Tester — free online tool
You wrote a regular expression and now you're not sure it actually catches what you meant. Maybe it grabs too much, maybe it misses one case, and staring at the symbols doesn't help. We added a free tool that does it — Regex Tester — right in your browser.
What it does
You paste your pattern and some text, and it shows you the matches live, highlighted right where they appear. As you change the pattern, the highlights update straight away. If your pattern uses groups, it shows those too, so you can see exactly which part caught what.
Nothing leaves your device
It all runs inside your browser. Your pattern and your text are never uploaded and never saved anywhere. When you close the page, it's all gone. Nothing touches a server.
How to use it
- Open Regex Tester and type or paste your regular expression.
- Add the text you want to test it against.
- Watch the matches and groups light up, and tweak the pattern until it's right.
It's free with no limit. There are more small tools on the Apps page.