I used
this[
^] to build the expression, so you might want to tweak it a bit depending on the specific RegEx implementation (it works on the site I mentioned :) ):
(\s[a-zA-Z]+){3}\s[0-9]+
Or if {3} dosn't work:
(\s[a-zA-Z]+\s[a-zA-Z]+\s[a-zA-Z]+)\s[0-9]+