Give my regards asks somebody to pass on your good wishes. Give my regards to your mother.
It takes to and it is more formal than saying hello for somebody. Regards on their own are a shade cool, which is why the phrase suits people you know only slightly.
1phrasegive my regardsAsk somebody to pass on your good wishes.
“Give my regards to everybody at the office.”
give my regards is a phrase.
Practised in Small Talk & Everyday Phrases