🔒 100% Client-Side
🔍 Regex Tester
Test regular expressions in real-time
Matches:
Enter a pattern to see matches
Test regular expressions in real-time
All regex testing happens in your browser. Your patterns and test strings never leave your device.
Real-time pattern matching with instant feedback as you type.
Once loaded, test regex patterns without internet connection.
No subscriptions, no hidden costs, completely free.
This regex tester runs entirely in your browser using JavaScript. When you test regular expressions, the processing happens completely on your device. We never upload your regex patterns or test strings to any server, which means your proprietary patterns, sensitive data, and validation logic remain completely private and secure.
Unlike online services that require data uploads, our client-side approach ensures zero data collection, zero server processing, and zero privacy concerns. Your regex patterns never leave your computer.
This tool uses JavaScript regex engine with support for global (g), case-insensitive (i), and multiline (m) flags. It follows the ECMAScript standard regex specification used by all modern browsers.
Yes! Simply enable the multiline (m) flag checkbox. This allows ^ and $ anchors to match at the beginning and end of lines, not just the beginning and end of the entire string.
The tool displays all matches found by your regex pattern. When using capture groups (parentheses in your pattern), the matched groups are shown in the results section with their captured values.
Yes! This tool is completely free with no hidden costs or subscriptions. We believe privacy-first tools should be accessible to everyone.
We use Google Analytics to track page views for website improvement, but we never see, store, or collect your regex patterns or test strings. All processing happens locally in your browser.