/C++/How can I replace a pattern from string in c++

How can I replace a pattern from string in c++

#include <string>
#include <regex>

std::string test = "abc def abc def";
test = std::regex_replace(test, std::regex("def"), "klm"); // replace 'def' -> 'klm'
// test = "abc klm abc klm"

Source: stackoverflow.com

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