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0 matches
Test string will appear here, with matches highlighted.Test regular expressions, highlight matches, and inspect groups.
Test string will appear here, with matches highlighted.Your vote is saved on this device only.
The Regex Tester lets you build and check regular expressions against your own sample text in real time. Paste a pattern, type or drop in test strings, and instantly see which parts match, where they start and end, and what each capture group contains. It removes the guesswork from writing regex, so you can refine a pattern until it matches exactly what you intend before pasting it into your code.
It is built for developers, data wranglers, and anyone debugging a tricky pattern in a config file, log line, or validation rule. Because it is free and runs entirely in your browser, your patterns and test data never leave your machine and nothing is uploaded to a server, which is ideal for sensitive logs or proprietary input.
No. The tool runs completely client-side in your browser, so both your regex and your sample text stay on your device and are never uploaded.
Yes. For every match the tool breaks out the captured groups so you can verify exactly what each parenthesized part of your pattern grabbed.
Matches are highlighted directly within your sample text, making it easy to spot every occurrence and check the start and end of each one.
No. The Regex Tester is free to use and needs no registration or sign-up.
When there are no matches, no highlights appear and no groups are listed, which usually means the pattern needs adjusting to fit your test text.