Regex Tester Online — Test Regular Expressions Live
Test regular expressions in real-time with capture groups and flags.
Runs in your browser · 100% Private (No upload)
Runs instantly in your browser. Nothing is uploaded.
FAQ
Regex Tester & Matcher — frequently asked questions
Which regular expression flavour does it use?
JavaScript regular expressions, with flags such as g, i and m, and the matches and capture groups shown live.
Why does my pattern work here but not in another language?
Regex engines differ in small ways, for example in lookbehind and named groups. Test with the same engine as your final code.
Are my text uploaded or stored anywhere?
No. Regex Tester & Matcher runs in your browser, so your text stay on your device and are never sent to our servers or saved anywhere.
Is Regex Tester & Matcher really free? Do I need to sign up?
Yes, it is completely free. There is no account, signup, watermark or email to hand over; open the page and use it as often as you like.
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QUICK GUIDE
How to use Regex Tester & Matcher
- Paste or type your text.
- Choose any options you need.
- See the result instantly below.
Privacy
This tool runs in your browser. No data is ever sent to a server.