Notepad++ Search Across Multiple Lines

If you want to search across lines for text match using regular expressions, you would need to make use of the carriage return \r\n, \r or \n based on what is the file encoding (Windows, Macintosh or Unix)

Let's take an example of a Windows encoded file with \r\n carriage return,

This is my file and I want to
search some text across multiple 
lines.

• Find What: I want to\r\nsearch
• Regular Expression: Ticked

This is my file and I want to
search some text across multiple 
lines.

Search "I want to\r\nsearch" (1 hit in 1 file of 1 searched)
  new 15 (1 hit)
	Line 1: This is my file and I want to

To search across lines, you will need to use a regex across multiple lines based on the below file types,

• Windows: \r\n
• macOS: \r
• Unix: \n

Tip: Press Ctrl + Shift + F to open Find in files