Swann was fined 10 percent of his match fee by the International Cricket Council for his audible angry remarks reportedly directed at the umpires when he couldn't grip the ball properly because of the heavy dew at Chittagong.
"It's obviously something disappointing. It was quite a shame what happened and my own behaviour," Swann said. "It was the frustration of the whole situation.
"There was nothing personal against the umpires. I apologised almost immediately when I realised it. It was unintentional."
England's loss to Bangladesh was its second shocking defeat of the tournament following an upset defeat to Ireland. And it means that the English must beat the West Indies to remain in contention for the quarterfinals.
"All things considered if we win four games from here we win the World Cup, which is the only way to look at it, " Swann said, trying to remain upbeat. "There is no point dwelling on the two games we lost and the game against India that we should have won from the situation we got ourselves in."
Swann said the team was trying to draw inspiration from its Twenty20 World Championship triumph last year.
"That's something we look to emulate. I think for starters we were a lot more consistent in that than we have been here. We didn't start fantastically well and we were genuinely hampered by the weather there.
"But that's the model we are looking to copy in this World Cup. As I said, there is no use crying over spilled milk by the two games we've lost. We just need to win four big games now."
Swann said England had proved it can be a contender for the title with a fighting, six-run win over South Africa and a high-scoring tie against India, but had struggled to be consistent.
"We know we can beat anybody. We proved that beating South Africa and the way we played against India," he said. "It's absolutely the biggest game in the tournament for us now until this point and normally that brings the best out of us.
"Hopefully we'll get both the facets together - the batting and the bowling."
