Regex Tester

Test regular expressions.

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Test String

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Frequently Asked Questions

Which regex flavor does this use?+

This tool uses JavaScript's native RegExp engine, the same one used in browsers and Node.js. Syntax may differ slightly from PCRE or Python regex.

What do the flags mean?+

Common flags: g (global, find all matches), i (case-insensitive), m (multiline), s (dot matches newline). Combine multiple flags, e.g. "gi".