Not exactly at insert mode, but this may be helpful: autocmd BufWritePre * :%s/\s\+$//e Before you save a file, it removes all trailing whitespace (ironic

Not exactly at insert mode, but this may be helpful: autocmd BufWritePre * :%s/\s\+$//e Before you save a file, it removes all trailing whitespace (ironically using the same regex as in the article -- hasn't given me trouble yet though)