How to replace line breaks with paragraph breaks in Libreoffice?

Here's the answer a an unusual technical question: In LibreOffice Writer, how to replace all the line breaks (seized with the combination of keys SHIFT + ENTER) with paragraph breaks (seized with the Enter key)?

It's simple but totally counter-intuitive. I decided to share my find here to find it later and so It can benefits to everybody.

•Run the find window (Ctrl + h)
•Check the regular expression checkbox
•in the search field and enter \n
•in the replace field, type \n
•click Replace all



It isn't a troll, replace \n with \n ... and it works...