Sep 9, 2026
Regex Tester: Build Patterns That Work the First Time (With Live Matching)
Test and visualize regular expressions live.
Read postRegex Tester & Visual Matcher
Test and visualize regular expressions live.
✏️ Sketching your tool…
About Regex Tester & Visual Matcher
Type a pattern and test text to highlight every match in real time.
🔒 This tool runs entirely in your browser. Nothing is uploaded or stored.
Frequently Asked Questions about Regex Tester & Visual Matcher
How do I use the Regex Tester & Visual Matcher?
Open the Regex Tester & Visual Matcher and use the controls in the workspace below: test and visualize regular expressions live. Results appear instantly in your browser, with nothing to install, sign up for, or pay for.
Is the Regex Tester & Visual Matcher free?
Yes. The Regex Tester & Visual Matcher is completely free, like every tool in the PrimeFreeTools library. There are no accounts, subscriptions, or usage limits.
Does the Regex Tester & Visual Matcher store or share my data?
No. The Regex Tester & Visual Matcher runs with JavaScript in your browser, so what you enter never leaves your device and nothing is stored on a server.
What can I use the Regex Tester & Visual Matcher for?
Type a pattern and test text to highlight every match in real time. You will find it grouped under Developer Tools together with 75 other free tools on the PrimeFreeTools homepage.