Regex Tester
Test a regular expression against sample text and see every match, capture group, and index update live as you type, with clear error messages for invalid patterns.
Matches
How this tool works
Type a pattern (without the surrounding slashes) and any flags, then paste or type test text below. Every match, its position in the text, and any capture groups update live as you type — no button to click, and invalid patterns show a clear error instead of silently failing.
A few useful patterns to try
\w+@\w+\.\w+ matches a simple email shape. ^\s*$ (with the "m" flag) matches blank lines in multi-line text. \d\d\d-\d\d\d\d matches phone-number-style groups of digits, separated by a hyphen.
Privacy by design
Matching runs entirely in your browser using JavaScript's native regular expression engine. Nothing you type is sent anywhere.
This tool runs entirely in your browser. Nothing you enter is uploaded or stored.
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