Saints twice took the lead, through Adam Lallana and Rickie Lambert, but Chris Dickson and Jo Kuffour cancelled out both strikes and Andy Williams popped up to hit a 95th-minute winner for the visitors.
Pardew said: "We had some good chances at 2-1 which we should have put away, but we didn't and that last period was sub-standard from us. I'm very disappointed."
Source: Team_Talk