Negative lookahead works just like positive lookahead, except that whereas positive lookahead matches when the regex inside the lookahead matches, negative lookahead matches when the regex inside the lookahead failed to match.

But all of a sudden though, just through the smoke / It's your bird laughing and joking with a bloke / Ain't just that either, as she moves closer / In a shape what looks like they're lovers, he's tonguing her!

Astronomers call the sudden changes in the neutron star starquakes. The energy released in a starquake is enormous and flows out from the star into the space surrounding it. After the 1969 starquake on the Crab pulsar, a wave of energy was seen to flow outwards, rippling through the centre of the Crab Nebula.

By the time the blue dress was tried on, Madame Cie had, with the aid of a few pins, plaits, and a bow of blue ribbon, transformed the half-lace shawl into one of the smartest and distingué things imaginable; but when the bill came in at Christmas, for that five minutes' labor and distingué touch, she charged one pound eight.