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You could hold a reference to this value in the registry index:
luaL_ref(current_state, LUA_REGISTRYINDEX);
In this way, there will always ne a reference to ut until you manaully remove the entry from the registry, thus the Garbage Collector won't collect it

Holding a reference in the registry will asure that you can access the string again, however, the const char* pointers returned from most Lua API calls will be invalid after the function returns as the manual states in