With
\r = carriage return = CR
\n = line feed = LF
New line characters across different operating systems:
All Linux / Unix: Newline = line feed = LF = \n
Old Mac OS: Newline = carriage return = CR = \r
Modern Mac OS: Newline = line feed = LF = \n
Windows & MS-DOS: Newline = carriage return followed by line feed = CR+LF = \r\n
Modern Windows: Newline = carriage return followed by line feed = CR+LF= \r\n
↳ However, as of 2024 Windows applications are increasingly capable of dealing with LF only line terminators (even Notepad).
Many tools, EmEditor included, can be configured to let \n detect all newline characters, regardless of type LF, CR+LF or CR.
I.e. you can stick to \n without having to bother about what the current file’s line terminator is.
Should you want to use \r\n:
In the find dialogue: Click Advanced... → Treat CR and LF separately
Advanced dialog box → Treat CR and LF Separately check box