Wikipedia has an international list of enacting formulae – the bits that go at the front of Acts of Parliament.
Though not a monarchist by any means, I always think that the British enacting formula is pleasantly orotund:
BE IT ENACTED by the Queen’s most Excellent Majesty, by and with the advice and consent of the Lords Spiritual and Temporal, and Commons, in this present Parliament assembled, and by the authority of the same, as follows:-