How to make paragraphs in block of text using Find & Replace

I have a block of text. I used “$” in Find and then 1 space bar in Replace to create the block of text.

How do I make paragraphs between sentences starting with certain words, such as an ‘A.’, for example, using Find & Replace?

I had found the answer to this on the forum back in 2013, using a certain wild card sequence, but I do not remember what it was.

You can use \n to insert a paragraph break in the replace box.