How to check if a string contains a char?

I have a text file that I want to read. I want to know if one of the lines contains [ so I tried :

if(array[i] == "[")

But this isn't working.

How can I check if a string contains a certain character?

Solution 1:

Look at the documentation string::find

std::string s = "hell[o";
if (s.find('[') != std::string::npos)
    ; // found
else
    ; // not found

Starting from C++23 you can use std::string::contains

#include <string>

const auto test = std::string("test");

if (test.contains('s'))
{
    // found!
}