[xmonad] float, match by regex?

so in .xmonad/xmonad.hs, I see how i can make a window float, by selecting it's title; however, suppose I wnat a bunch of windows to float, i.e.: "float1" "float2" ... is it possible to instaed of listing out all titles, specify a regex, or a function that goes [Char] -> Bool ? (for deciding whether to float the window or not) thanks!