In Notepad++, removing any text not matching a certain string on each line?

I have something like:

oiuerer jeff oteaweawe
gnwaeeeee开发者_开发知识库 jeff nbbaweee
bbbadx  jeff nvxxawee

I would like to remove the text which is both before and after the word "jeff" so that each line is only "jeff". How can I do this with regex? Thanks

Replace .*jeff.* with jeff?

Press Ctrl+h to open this dialog.