std::string str = "Hello World!"; str.replace(str.find("World"), 5, "Universe");
CStdString str = "The quick brown fox jumps over the lazy dog."; str.Replace("brown", "red");In this example, the CStdString Replace function is used to replace the substring "brown" in the string "The quick brown fox jumps over the lazy dog." with the substring "red". The function simply replaces all instances of the "brown" substring with the "red" substring. Overall, the CStdString Replace function is a useful tool for manipulating strings in C++. It is part of the MFC library, which is a package developed by Microsoft for creating Windows applications using C++.