capture tmux screen and process with shell command

is there a way to capture text currently on the screen of a tmux session and pipe it into a shell command then display the output?

I was hoping to use something like this with Oracles sqlplus to do keyword expansion. I only have access to tmux 1.5 and the stock sqlplus. I do have access to perl 5.14 and python 3.4

best regards,

Ty