まんま >> require "hpricot" => true >> doc = Hpricot("That's my <b>spoon</b>, Tyler.") => #<Hpricot::Doc "That's my " {elem <b> "spoon" </b>} ", Tyler."> >> doc.at("b").swap("<i>fork</i>") => [{elem <i> "fork" </i>}] >> doc.to_html => "That's my <i>fork</i>, Tyler."