Regex Tester
Test regular expressions in real time. See matches highlighted in your text, capture groups, and match positions. Common patterns library included.
Matches will appear here…
Frequently Asked Questions
What regex flavor does this tool use?
This tool uses JavaScript's built-in RegExp engine, which is the same regex flavor used in Node.js, browsers, and most web applications. It supports flags g (global), i (case insensitive), m (multiline), and s (dotall).
What are capture groups?
Capture groups are portions of a regex pattern enclosed in parentheses (). When a match is found, the tool shows each group's captured text separately, making it easy to extract specific parts of a match.
Does the tool include common regex patterns?
Yes. Click the 'Patterns' button to see a library of common patterns including Email, URL, IP address, phone number, hex color, date, HTML tag, and digits-only patterns.
Is this a good alternative to regex101?
Yes. This tool offers real-time matching, highlighted preview, capture group display, and a common patterns library — all running client-side with a clean, modern UI and no ads.