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    21	    if(str.find_first_not_of("[0123456789]") == std::string::npos)

$ ./a.out

Enter an IP address in decimal: [1].2.3.4
 
terminate called after throwing an instance of 'std::invalid_argument'
  what():  stoi
Aborted

$ ./a.out

Enter an IP address in decimal: 1].2.3.4
 
1].2.3.4 is a valid IP address.

$ ./a.out

Enter an IP address in decimal: [1].2.3.4
 
[1].2.3.4 is not a valid IP address.

$ ./a.out

Enter an IP address in decimal: 1].2.3.4
 
1].2.3.4 is not a valid IP address.