public: class FString __thiscall FString::Substitute(class FString const &, class FString const &, int)

Mangled name

?Substitute@FString@@QAE?AV1@ABV1@0H@Z

Exported by

size	filename	version
953304	Core.dll
1010880	Core.dll

Imported by

size	filename
8347648	nwindow.dll
8147968	Engine.dll