RegexMateAbout Us
RegexMate is a one-tool site. We build a regular expression tester — tests and debugs regular expressions against sample text in real time, visualizing matches, capture groups and a plain-English explanation of the pattern — and nothing else. No sign-up, no mailing list, no paywall: you open the page and use it.
Why we built this
Search for developer tools and you will mostly find pages that bury a single calculation under cookie walls, newsletter modals and three paragraphs of filler. We built RegexMate as the opposite: one focused tool that tests and debugs regular expressions against sample text in real time, visualizing matches, capture groups and a plain-English explanation of the pattern, and nothing between you and the answer. Keeping it that narrow is what makes it fast, and what makes it honest about how the result is produced.
How it works
The whole calculation is client-side JavaScript. What happens is this: it runs your pattern against the sample with backtracking limits so a catastrophic pattern cannot lock the tab, and it highlights each match and capture group with its position so you can see exactly what the engine matched. Because the method is published here, any disagreement you find can be traced to a particular step instead of being blamed on a black box.
Your data stays here
Privacy here is a property of the design, not a promise: the pattern and test text you enter never leave your browser, because the calculation runs there. There is no server to receive them, no store to hold them, and no third party with access to them.
Who it is for
- developers wiring up an API or a config.
- engineers checking a value before it ships.
- anyone who wants a tool that runs locally.
Keeping the lights on
RegexMate costs nothing to use, and the hosting is paid for by advertising. That advertising is kept separate from the calculation: it cannot see what you type and it has no influence on the result.
Contact
Spotted a mistake or missing a feature? The contact page takes it. The suggestions that get acted on usually come from people who actually use the regular expression tester.