Regex Tester

JavaScript RegExp engine with lookahead, lookbehind, named groups, and Unicode properties.

Yes! Matching groups are highlighted with different colors.

Matches are highlighted in real-time so you can verify your pattern.

The Regex Tester is an online tool that lets you test and debug regular expressions in real-time. It is part of NexTool's collection of free tools designed to help you work faster and more efficiently.

Using the Regex Tester is simple: visit the tool page, enter your data or input into the provided fields, and get instant results. Follow the controls on the page. Some functions require sign-in or a paid plan; see Pricing for limits.

The Free plan includes 10 tool uses per day. Some features require an account or a paid plan. Check the controls on the tool page and Pricing for the applicable limits.

The Regex Tester returns results based on the inputs and the tool methodology. Check assumptions, units and source dates. Treat projections as estimates. For critical decisions, always consult a qualified professional.

The Regex Tester is designed to be language-agnostic where applicable. It processes input directly in your browser, so there are no compatibility issues. Check the tool description for specific format support.