About This Tool
Write a regular expression pattern and test it against sample text in real time. Matches are highlighted inline with group capture details. Supports all JavaScript regex flags (g, i, m, s, u, d).
Free Tool
Regex Tester
Test regular expressions against sample text with real-time match highlighting. Supports JavaScript regex syntax with flags.
Frequently Asked Questions
This tool uses JavaScript's built-in RegExp engine. It supports all standard regex syntax including lookaheads, lookbehinds, named groups, and Unicode properties.
Flags modify how the pattern matches. Common flags: g (global - find all matches), i (case-insensitive), m (multiline - ^ and $ match line boundaries), s (dotAll - . matches newlines).
Check that you have the correct flags enabled (especially g for multiple matches and i for case-insensitive). Also verify that special characters like . * + are escaped with \ if you want to match them literally.
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