I frequently work with code style which asks that many non-class symbols use `snake_case` -- Python, Ruby, and C especially. If I have a symbol like `longfirstpart_longsecondpart`, I'd like to be able to jump to the underscore in the middle *à la* `w` skipping to the next `word`.

Is there a built-in shortcut or `init.vim` variable for this kind of behaviour?