Regex replace Help needed

I have a string SmithMaryJane

I can identify it with this '[A-z][a-z]+[A-z][a-z]+[A-z][a-z]+'

I need the syntax to do a replace so the string is Smith Mary Jane
I've never used the rgx.Replace(input, replacement) before and can't figure it out.
Doing this in vba

Thank for reading my post and great thanks if you have a solution!