I know not all, but a lot of us on here are married.
just working out some figures (oh the joy) with H tonight and he came out with the line I hate 'well, if we handnt spent so much on the wedding, we would be in a different place now'. He says he doesn't regret it at all, but he regularly mentions that we could have put that money into our house/future.
my opinion differs depending on what day it is and what I want at that time! If there is something I want but we can't afford (a baby!), then it does get me thinking but generally, I don't regret a penny and put it all down to the cost of milestones in life (wedding, house, baby etc). Plus I loved every part of our wedding.