Which regex flavour is used?

JavaScript (ECMAScript), including named groups, lookbehind and Unicode property escapes with the u flag.

What do the flags do?

g finds all matches, i ignores case, m makes ^ and $ match at line breaks, s lets . match newlines, u enables full Unicode and y matches only at the current position.

Is my data sent to a server?

No. Everything is processed in your browser, which matters when the input is a production payload, token or query. Nothing is uploaded, logged or stored.

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