Testing if the string meets the Right format C++ - c++

Question

I am currently trying to test if a read in string matches the following format, without the use of regex.
The format the code should be in, is:
Supplier Reference: XXXXXXX
Date & Time: XXXX
Name of Device: XXXXX
Priority: X
IP Address: XXXXXXXXXXXXXXXXXXXX
Event ID: XXXXXX
Description of Event: XXXXXXXXXXXX
I want the code to have a cout << "Format is incorrect" << endl;.
This is edit, taken out previous attempt and gone back to basics to explain my logic:
using namespace std;
int f;
int main()
{
string mystring;
ifstream myfile ("test.txt");
if (myfile.is_open())
{ while (getline (myfile,mystring))
{
//searches the text entered//
string search;
size_t pos;
{
//searches the text for the Date entry//
{
search = "Supplier Reference:";
pos = mystring.find(search);
{
if (pos != string::npos)
{
cout<<mystring<<endl;
f=f-1;
}
else
{
++f;
}
}
}
{
search = "Date & Time:";
pos = mystring.find(search);
{
if (pos != string::npos)
{
cout<<mystring<<endl;
f = f - 1;
}
else
{
++f;
}
}
}
{
search = "Name of Device:";
pos = mystring.find(search);
{
if (pos != string::npos)
{
cout<<mystring<<endl;
f = f - 1;
}
else
{
++f;
}
}
}
{
search = "Priority:";
pos = mystring.find(search);
{
if (pos != string::npos)
{
cout<<mystring<<endl;
f = f - 1;
}
else
{
++f;
}
}
}
{
search = "IP Address";
pos = mystring.find(search);
{
if (pos != string::npos)
{
cout<<mystring<<endl;
f = f - 1;
}
else
{
++f;
}
}
}
{
search = "Event ID:";
pos = mystring.find(search);
{
if (pos != string::npos)
{
cout<<mystring<<endl;
f = f - 1;
}
else
{
++f;
}
}
}
{
search = "Description of Event:";
pos = mystring.find(search);
{
if (pos != string::npos)
{
cout<<mystring<<endl;
f = f - 1;
}
else
{
++f;
}
}
}
}
}
{
if (f>35)
cout << f << "Field is missing, Ticket is formatted incorrectly" << endl;
}
}
system ("pause");
return 0;
}
I know the code is incredibly repetitive. Cheep and Cheerful is what I'm aiming for.
I was hoping someone could let me know how to test for the order of the lines?

Answer 1

One way to solve this is to read seven lines (one for each line of data). If a line is empty, then discard it and don't count it.
Then for each line, you split it into two strings at the colon ':'. Use the left part (e.g. "Supplier Reference") as the key into a std::map with the right part as data.
Then just loop over the map and make sure that each key matches the needed keys from the file. If a key is missing, or an unknown key is in the map (or if there are not enough lines when reading from the file) your have a format error.