Regex Tester
Test and validate regular expressions with real-time matching and feedback. Perfect for debugging regex patterns.
g=global, i=case-insensitive, m=multiline
Test Regular Expressions Online with Our Regex Tester
Our free regex online tool helps developers, data analysts, and programmers test regular expressions instantly. Whether you're validating email addresses, extracting data patterns, or debugging complex regex patterns, this pattern matcher provides real-time results with detailed match information.
How to Use the Regex Tester
- Enter your regular expression pattern in the "Pattern" field (e.g.,
\d+for digits) - Add flags like g (global), i (case-insensitive), or m (multiline) as needed
- Paste or type your test string in the "Test String" textarea
- Click "Test Regex" to see all matches highlighted with detailed results
Features
- Real-time regex pattern matching and validation
- Support for all JavaScript regex flags (g, i, m, s, u, y)
- Instant error detection for invalid patterns
- Display all matches with count and values
- 100% free with no signup required
- Works entirely in your browser - no data sent to servers
Benefits
Save time debugging regular expressions with instant visual feedback. Perfect for developers working with data validation, text parsing, or pattern matching in JavaScript, Python, or any language that supports regex. Test and refine your patterns before implementing them in production code.
Frequently Asked Questions
Is this regex tester free to use?
Yes, our regex online tool is completely free with no limitations. Test as many patterns as you need without any signup or subscription.
What regex flags are supported?
We support all JavaScript regex flags: g (global), i (case-insensitive), m (multiline), s (dotAll), u (unicode), and y (sticky).
Can I test complex regex patterns?
Our pattern matcher handles simple to complex regular expressions including lookaheads, lookbehinds, capturing groups, and character classes.
Is my data secure when using this tool?
Yes, all regex testing happens locally in your browser. No data is sent to our servers, ensuring complete privacy and security.