I agree there are some surprising lacks (most 74 series ttl for instance) but there are a number of people (me among them) working on adding parts. I think there is a 7805 regulator and it probably has a parameter to change voltage (or at least part number) but I wouldn't necessarily be surprised if it isn't in core but an add on somewhere. As well it is good to use part search (the magnifying glass in the parts bin) as there are some parts in core that don't show up in the window (don't know why ...).
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