Regard vs. Regards

One more grammar nitpickery here concerning whether to add an s on the end of a word. As we now know, toward vs. towards all depends on geographic location. With regard and regards, though, the rule will be the same no matter where in the world you are.

All the style guides agree that you absolutely should not use an s. So you'll have: in regard to (not in regards to).

The only time it might be appropriate to add that pesky s on the end would be when you're giving your regards. For instance: give my regards to your family.

So, to recap:

Correct:
His comment on improving my manners was in regard to our last date.

Correct:
Please give my regards to the Duke and Duchess of Cambridge.

And now you know which wins when in the battle between regard and regards.