backward-kill-sexpbackward-kill-sexp is an interactive compiled Lisp function in `
lisp.el'. It is bound to ESC <C-backspace>, ESC <C-delete>.
(backward-kill-sexp &optional ARG) Kill the sexp (balanced expression) preceding point. With ARG, kill that many sexps before point. Negative arg -N means kill N sexps after point. This command assumes point is not in a string or comment.