Regex Tester lets you build and debug regular expressions in real time. Enter a pattern and flags, paste your test string, and see every match highlighted with its capture groups. Great for validating input formats, extracting data and learning regex without leaving your browser.
Your data is processed entirely in your browser. Nothing is uploaded to any server.
Yes, Regex Tester is 100% free and runs entirely in your browser.
No. Everything is processed locally on your device; nothing is uploaded.
No. Regex Tester runs in any modern browser, no installation or signup required.
Yes. Your input stays in your browser and is never stored or transmitted.