Question

I’m trying to compare a char * to a to a std::string

const char *s = "0@s072116\tblah\tblah\blah";
std::string id = "072116";

I need to compare these two, basically before the first \t and after the first 3 chars on the left. The width of the id can vary. 🙁

I’m not very good at C++. Any ideas??

Thanks

Answer 1

You can do it as follows:

#include <iostream>
#include <string>
using namespace std;

...

int main() {
    const char *s = "0@s072116\tblah\tblah\blah";
    string ss = s;
    string id = "072116";
    int found = ss.find(id);
    cout << "found is: " << found;
}

If id is a substring in ss, then found will be the position of the first occurrence of id in ss.

If id is not a substring in ss, then found will be a negative number.

More examples on find.

Caveat:

The code above is based on the assumption your meant “…basically before the first \t and after the first 3 chars on the left…” as a way to point out where the substring would be matched in this particular example.

If instead it is a requirement that must be met for all instances (i.e. const char *s = "0@s\tblah\tblah\blah072116" should not be matched), then the provided code sample is not sufficient.