Regex Tester & Matcher
Test your Regular Expressions (Regex) in real time with syntax highlighting and match group details.
Test Regular Expressions dynamically inside your browser sandbox
Matched Groups & Captures
How to use this tool
Real-time Evaluation
Regular expressions compile and run immediately inside your browser’s local JavaScript RegExp engine. Your test strings are never sent to external servers.
How to Test Expressions
Write pattern logic and test strings to verify matches and groups.
Define Pattern
Write your regular expression pattern (e.g. [a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}).
Toggle Flags
Select match flags: g (global match), i (case insensitive), or m (multi-line).
Analyze Matches
Input your test string and view highlighted match boundaries and capture groups instantly.
Frequently Asked Questions
Quick answers about regular expressions.
Which Regex flavor does this tester use?
This tester uses the native JavaScript RegExp engine running inside your browser. Most syntaxes are compatible with PCRE, Python, and Java formats, though advanced features like lookbehinds might vary.
How do capture groups work?
Parentheses () inside a pattern define a capture group. The tester highlights the overall match and lists the sub-string caught by each individual capture group in a results list.
Privacy & Safety Policy
All tools run completely in your browser via client-side JavaScript. We do not upload your files, interest parameters, or JSON payloads to any server. Your data remains yours.