Is there a Reference Document of Data Format Functions?

Is there a reference document somewhere, preferably with some examples, of what all the Data Format functions do, especially the Text ones?

It would really help right now and save me spending time experimenting to find the option I want on each occasion.

So as an example, right now I want to grab the last 3 characters of some text… I’ve no idea how to do that!

Thanks!
Antony.

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