Check if character in string c++

How to check string contains char in c++

std::string s = "Hello";
if (s.find('e') != std::string::npos)
    cout << "Found";
else
    cout << "Not Found";

std::string s = "hell[o";
if (s.find('[') != std::string::npos)
    ; // found
else
    ; //

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