regard
noun
uk/rɪˈɡɑːd/ usregards [ plural ]
COMMUNICATIONS
used to send good wishes to someone at the end of a letter or an email, or to ask someone to give greetings to another person who is not present:
I look forward to hearing from you. With kind regards, David Price.
Please convey my regards to your boss.
in/with regard to sb/sth
in connection with someone or something:
I am writing to you with regard to your letter of 15 March.