Search and Replace with New Line in Notepad++
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This article describes how to use Notepad++ to search for \n or similar characters in a text file and replace it with a new line.
How to Search and Replace with New Line
Set extended search mode in search and replace dialog.
When looking for \n you have to search for \\n (yes, with two backslashes before the n)
In the replace field enter \r\n for a new line (at least in Windows).
With the extended mode active it will find the \n and replace it with new line characters.