Regex Tester Online Free
Use our free regex tester online — no signup, no installation, no limits.
Test and debug your regular expressions in real time with our free online regex tester. See matches highlighted instantly, inspect capture groups, and get plain-language explanations of your patterns. Supports JavaScript, Python, and other regex flavors.
Try Regex Tester — 100% Free
Start using our regex tester right now. No account required, works entirely in your browser.
Open Regex Tester FreeKey Features
- Real-time regex matching with instant highlighting
- Capture group visualization and match details
- Support for multiple regex flavors (JavaScript, Python, PCRE)
- Regex flag toggles: global, case-insensitive, multiline, dotAll
- Plain-language explanation of your regex pattern
- Common regex patterns library for quick reference
How to Use Regex Tester Online
- 1Enter your regular expression in the pattern field
- 2Paste your test string in the text area
- 3View highlighted matches and capture groups in real time
- 4Adjust flags and refine your pattern as needed
- 5Copy the working regex for use in your code