Cpp

std::regex r("(d{3}) d{3}-d{4}"); // e.g. "(012) 345-6789" 
auto isValidPhoneNumber = std::regex_match(phone_num_str, r);

Copy Code^([+][9][1]|[9][1]|[0]){0,1}([7-9]{1})([0-9]{9})$

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