What regex flavor does this use?

This tool uses JavaScript's built-in RegExp engine, which supports most standard regex features including lookaheads, lookbehinds, and named groups.

Can I use replace mode?

Yes, enable replace mode to test replacement patterns. Supports special replacement patterns like $1, $&, $`, and $'.

Test regular expressions with real-time matching and highlighting

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Regular Expression

Test String

What regex flavor does this use?

This tool uses JavaScript's built-in RegExp engine, which supports most standard regex features including lookaheads, lookbehinds, and named groups.
Can I use replace mode?

Yes, enable replace mode to test replacement patterns. Supports special replacement patterns like $1, $&, $`, and $'.