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run code in 200+ php & hhvm versions
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<?php var_dump(preg_match('#^[a-z\\d\\-.а-я]+\\.[a-zа-я]+$#u', 'стикер163.рф'));
Output for 4.3.3 - 7.2.0
int(1)
Output for 4.3.0 - 4.3.2
int(0)