email  mails[16] = {
                       "regex_cpp@net.br",
                       "reg_ex.cpp@org.nz",
                       "reg_ex.cpp@net.org.br",
                       "regex_cpp@terra.com.br.net",
                       "regex_cpp@hotmail.com",
                       "regex_cpp@hotmail.com.br",
                       "regex_cpp@yahoo.com",
                       "regex_cpp@yahoo.com.br",
                       "regex_cpp@gmail.com",
                       "reg_ex.cpp@gmail.com.br",
                       "regex_cpp@uol.com",
                       "regex_cpp@uol.com.br",
                       "regex.cpp@bol.com",
                       "regex_cpp@bol.com.br",
                       "regex_email@terra.com",
                       "regex_email@terra.com.br"
                      };

Email: regex_cpp@net.br is Invalid

    Email: reg_ex.cpp@org.nz is Invalid

    Email: reg_ex.cpp@net.org.br is Invalid

    Email: regex_cpp@terra.com.br.net is Invalid

    Email: regex_cpp@hotmail.com is Invalid

    Email: regex_cpp@hotmail.com.br is Valid

    Email: regex_cpp@yahoo.com is Invalid

    Email: regex_cpp@yahoo.com.br is Valid

    Email: regex_cpp@gmail.com is Valid

    Email: reg_ex.cpp@gmail.com.br is Invalid

    Email: regex_cpp@uol.com is Invalid

    Email: regex_cpp@uol.com.br is Valid

    Email: regex.cpp@bol.com is Invalid

    Email: regex_cpp@bol.com.br is Valid

    Email: regex_email@terra.com is Invalid

    Email: regex_email@terra.com.br is Valid