How to remove unwanted paragraph marks

This tip is good for removing paragraph marks and the end of each of a series of lines, while retaining relevant paragraph breaks.

Notepad++ Method (downloadable at https://notepad-plus-plus.org/downloads/ )

Open the file in Notepad++.
Press Ctrl + H to open the Replace dialog.
Search mode: Select "Regular expression."

Part 1: Replace single newlines (except where preceded by double spaces):
Find what: ([^ \t\r\n])\r\n([^ \t\r\n])
([^ \t\r\n]): Capture any character that is not a space, tab, or newline. This is the character before the single newline.
\r\n: The single newline to be replaced.
([^ \t\r\n]): Capture any character that is not a space, tab or newline. This is the character after the single newline.
Replace with: \1 \2
Click "Replace All." This will join lines separated by a single newline, adding a space between them.

Part 2: Ensure correct paragraph spacing (removes remaining double paragraph marks)
Find what: \r\n\r\n
Replace with: \r\n\
Click "Replace All".

Part 3 (optional): Reduce triple newlines back to double
Find what: \r\n\r\n\r\n
Replace with: \r\n\r\n
Click "Replace All" This will change any instances of three \r\n back to two, further correcting paragraph spacing.
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If it were line breaks this is the code ([^ \t\r\n¬])¬([^ \t\r\n¬]) - same methodology.