Two suggestions:

regex = re.compile(r'^([a-zA-Z0-9-]+\.)*[a-zA-Z0-9-]+.?$')

(and a slightly less intuitive version that actually accomplishes the same)
regex = re.compile(r'^([a-zA-Z0-9-]+\.?)+$')

-- 
hostname permitted containing consecutive dots
https://bugs.launchpad.net/bugs/105890
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