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Vi / Vim single optional character in a regular expression

Last Modified: 2012-05-12
I'm doing a search and replace so I want to add a character return after all the paragraph tags so that the code is easier to deal with in vim.

but I also want it to do this for the closing tags as well.  I heard the ? is sometimes used for a single optional character but I still haven't figured out how to find deal with a single optional character.

I tried this:
and this
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