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Regex Tester Pro
Test and debug regular expressions in real-time. View match counts and highlighted results with full flag support.
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Why Use a Regex Tester?
Regular expressions are powerful but tricky to get right. A regex tester gives you instant feedback on your patterns, showing exactly what matches and what doesn't — so you can iterate quickly and avoid bugs in your string processing logic.
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Frequently Asked Questions
This tester uses JavaScript's built-in RegExp engine, supporting standard patterns including groups, lookaheads, character classes, quantifiers, and flags (g, i, m, s, u, y).
No. All regex testing happens entirely in your browser. Your patterns and test data never leave your device.
Enter flags in the flags field: g (global - find all matches), i (case-insensitive), m (multiline - ^ and $ match line boundaries), s (dotall - . matches newlines), u (unicode), y (sticky).