Regex Tester
Test and match regular expressions
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Common patterns
About Regex Tester
Test and debug regular expressions in real-time with instant match highlighting. See all matches, capture groups, and positions as you type. Includes common regex patterns for quick reference.
Frequently Asked Questions
What regex engine does this use?▼
It uses JavaScript's built-in RegExp engine, which supports standard regex syntax including lookahead, lookbehind, named groups, and Unicode properties.
Can I use regex flags?▼
Yes, you can add flags like g (global), i (case-insensitive), m (multiline), and s (dotAll) to your regular expression.
Are there pre-built patterns available?▼
Yes, common patterns for email, URL, IP address, and phone number are available as quick presets that you can use as starting points.