Input

row 1
row 2

row 1

row 1
row 2
row 3
row 4
row 5
row 6

row 1
row 2
row 3
row 4
row 5

The regex should only return the paragraph consisting only of row 1

row 1

I tried something like v/(\n\n) /d for the first, but didn't get it to work.

CodePudding user response：

You can use

:%s/\v\n*. (\n. ) \n*/\r/g

This command replaces all occurrences in the file of the following

• \v - enables very magic mode to avoid escaping hell
• \n* - matches zero or more line breaks
• . - one or more chars other than line break chars (a non-empty line)
• (\n. ) - matches one or more non-empty lines
• \n* - zero or more newlines.

The replacement is a line break, \r, to avoid line concatenation if there are several matches.