Your data never leaves your browser. We do not store inputs.
About Regex Tester
The Regex Tester is a free online tool that lets you test and debug regular expressions in real-time. See matches, groups, and replacements instantly as you type.
How to Use Regex Tester
Enter your regular expression pattern
Enter test text to match against
View matching results in real-time
Check captured groups and matches
Common Use Cases
Testing regex patterns before using in code
Debugging complex regular expressions
Learning regex by experimenting with patterns
Frequently Asked Questions
How does the Regex Tester is a free online tool that lets you test and debug regular expressions in real-time work?
Simply follow the on-screen instructions. All processing happens in your browser - no data is sent to our servers.
Is this tool free to use?
Yes, completely free. No sign-up, no limits, no hidden fees. Use it as many times as you need.
Is my data safe?
Yes. All processing happens directly in your browser. Your data is never sent to or stored on our servers.
Can I use this on mobile?
Yes, the tool is fully responsive and works on all devices including smartphones and tablets.