Writing Memos

Dana, 

I'm not familiar with the use of 'as regards', but these are the following terms that can be used in a memo:

"In regard to", "regarding", and "with regard to" - meaning 'on the subject of'.

You should use it to introduce a new topic or a topic that has been previously discussed (in another correspondence or meeting).  For example, 

"In regard to your request for time off, I don't think it will be a problem if you can find someone to cover some of your daily tasks."

I hope this helps.

Kim