Regex Tester & Debugger
Test regular expressions in real time with match highlighting, group captures, and common presets. Everything runs in your browser.
How It Works
Write your regex
Type or paste a regular expression pattern. Use flag checkboxes to toggle global, case-insensitive, multiline, or dot-all modes.
Enter test text
Paste or type the text you want to test against. Matches are highlighted instantly as you type.
Inspect matches
See match count, individual matches, and capture groups. Copy matches or use a preset to get started quickly.
Why Use a Regex Tester?
Regular expressions are powerful but tricky to get right. A live regex tester lets you iterate on patterns instantly, see exactly what matches, and debug capture groups without running your code.
This tool highlights matches in real time, shows capture groups for each match, and provides common presets for email, URL, phone, IP, and date patterns. No data is sent to any server — everything runs in your browser.