Searching for code snippets in the Warehouse

All of the files at once? Or individually? If you want to search through all the tuning files at once you will need a third party program like Notepad++. Export and associate the tuning files with N++ and then open them all, Ctrl + F to open search window, enter the phrase and then select search through all open files.

If you mean individually/one at a time, then click inside the tuning file in S4S (like actually click where the code is) then Ctrl + F and search.