"Exploding" a paragraph into individual lines

I'd like to take a paragraph like the following:

This is a paragraph. Wow! What do I do now?

And break it into individual lines, ala:

This is a paragraph.
Wow!
What do I do now?

StackExchange revealed this regex that seems to work well matching the proper lines:
[.!?][])"']*\($\|[ ]\)

So I can do this:
:%s/[.!?][])"']*\($\|[ ]\)/XXX\r\r/g

But obviously need something where XXX is!

c

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