Simple patterns to do useful things with the Ex Mode :global command in Vim
Delete all lines that match a pattern (:help pattern)
:g/pattern/d
:global/pattern/delete
Delete all lines that don’t match a pattern (:help :vglobal)
:g!/pattern/d
:v/pattern/d
:vglobal/pattern/delete
Remove all trailing whitespace with :substitute
:%s/\s\+$//e
Find more info by running :help :global
and :help :substitute