c++ - how to add characters that aren't alphanumeric -


i have program working way want handling alphanumeric values wish create exception of allowing periods, hyphens, , underscores. want negate other characters illegal. 

void accountdata::assignaccount() {     std::cout << "input account name: ";     std::string inputaccount;     std::getline(std::cin, inputaccount);     std::string useaccount = inputaccount.substr(0, 15);      if (std::all_of(begin(useaccount), end(useaccount), std::isalnum)) varaccount = useaccount;     else     {         bool valid = true;          while (valid)         {             std::cout << "\naccounts can contain alphanumeric values exceptions of _-.\n\ninput account name: ";             std::getline(std::cin, inputaccount);             useaccount = inputaccount.substr(0, 15);              if (std::all_of(begin(useaccount), end(useaccount), std::isalnum))             {                 varaccount = useaccount;                 valid = false;             }         }     } }

you can write own predicate , use all_of this:

bool myfun(char a) {     return (isalnum(a) || a=='_' || a=='-' || a=='.'); } void accountdata::assignaccount() {     std::cout << "input account name: ";     std::string inputaccount;     std::getline(std::cin, inputaccount);     std::string useaccount = inputaccount.substr(0, 15);      if (std::all_of(begin(useaccount), end(useaccount), myfun)) varaccount = useaccount;     else     {         bool valid = true;          while (valid)         {             std::cout << "\naccounts can contain alphanumeric values exceptions of _-.\n\ninput account name: ";             std::getline(std::cin, inputaccount);             useaccount = inputaccount.substr(0, 15);              if (std::all_of(begin(useaccount), end(useaccount), myfun))             {                 varaccount = useaccount;                 valid = false;             }         }     } }

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