Which is as close to "unregulated" as useful definitions go: once unleashed and bootstrapped, no human nor political organization can directly drive it. It's only self-regulated the way a free market is self-regulated, which is almost the exact opposite of what one has in mind when they talk about "regulations".
(Actually governments can influence its value significantly, by stating on its legality, and the legality/taxation of its conversion into state moneys / commodities).
The main feature of BTC is that, independently of regulation by any other entity that may be applied to it, it is "regulated" by the design of the protocol, which, among other things, provides decentralized issuance and transaction verification, and predefined supply constraints.
A popular myth about BTC is that it is unregulated (and, in some forms of the myth, impossible to regulate) by government.