# from:
#   https://w3techs.com/technologies/overview/top_level_domain/all
#   http://www.statista.com/statistics/265677/number-of-internet-top-level-domains-worldwide/
common_tlds = '|'.join((
    'com',
    'ru',
    'net',
    'org',
    'de',
    'jp',
    'uk',
))
