Replacing any character which is in specific combination

Hello. I hope you’re well and in good spriits.
A download process deleted all the paragraph breaks in an audio transcript. It left the long document full of character combinations I can describe as
letter period letter
Example:
“…armchairs.On the other hand…”
I would like to do a search and replace to insert a paragraph break just after the period, no matter what the letter before and after the the period is.
It looks like the wildcard character for “any character” is a period, though. So I can’t figure out how to write the search-and-replace.

You can escape special characters in a regular expression (not wildcard character) with a backslash.

Use Edit>Find & Replace with Regular expressions enabled.

In Find:, enter (.)\.(.) where parentheses are used to create “capture groups”.
In Replace: enter $1\n$2. $n references the designated capture group.

PS: when asking here, always mention OS name, LO version and save format. This helps to suggest the best solution.

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I can’t log back in for some reason. So - Thank you.