# http://stackoverflow.com/q/33622988/5290909
import re
string_reg = 'add23khh234 ... add2asdf675 ... xxxadd2axxx'
string_reg = re.sub(ur'\badd\w*', 'REMOVED', string_reg)
print(string_reg)
IyBodHRwOi8vc3RhY2tvdmVyZmxvdy5jb20vcS8zMzYyMjk4OC81MjkwOTA5CmltcG9ydCByZQoKc3RyaW5nX3JlZyA9ICdhZGQyM2toaDIzNCAuLi4gYWRkMmFzZGY2NzUgLi4uIHh4eGFkZDJheHh4JwoKc3RyaW5nX3JlZyA9IHJlLnN1Yih1cidcYmFkZFx3KicsICdSRU1PVkVEJywgc3RyaW5nX3JlZykKcHJpbnQoc3RyaW5nX3JlZyk=