Regex Tester
Test and debug regular expressions with live matching
✨ 100% Free Tool - No sign-up required!
How to use: Enter regex pattern → Add test text → Set flags → View live matches highlighted
Common Patterns
Frequently Asked Questions
Is this regex tester free to use?
Yes! This regex tester is completely free with no sign-up required. Test unlimited regular expressions with live matching and highlighting.
How do I test a regular expression?
Enter your regex pattern, paste your test text, set the appropriate flags (g, i, m, s), and click "Test Regex". Matches will be highlighted in yellow in real-time.
What are regex flags?
Regex flags modify how patterns match: g (global - find all matches), i (case-insensitive), m (multiline - ^ and $ match line boundaries), and s (dotAll - dot matches newlines).
What can I use regex for?
Regular expressions are used for pattern matching, validation (emails, phone numbers), text searching and replacing, data extraction, and parsing. Common uses include form validation, log parsing, and data cleaning.
Is my data private?
Yes! All regex testing happens in your browser. Your patterns and test strings are never sent to any server, ensuring complete privacy and security.