Simplest way to say search all spaces, except hair space

I know I could list out all the space options separated by "|" but I want to be able to say \s but not ~| 

How do I say this simply in GREP? Is there a way to Escape something like this?

Here is my full GREP find: 

(?<!~<)( ?)(~_|~=|~-­|~~)( ?)(?!~<)

Change to: 

~|$2 ~|

But I want to change the ( ?) to (\s?) with this escape. What is the easiest way to do this?