How can I do this:

Let | be the current cursor position, "bold" as "underlined"

when: (this | is the (example text))

emacs will: **(this | is the (example text))**

when: (this is the (example | text))

emacs will: (this is the **(example | text)**)

thanks you guys, [vim version is here](https://stackoverflow.com/questions/12161508/is-it-possible-to-have-vim-underline-the-scope-of-parentheses-my-cursor-is-curre)