Removing line breaks NOT preceded by NULL

Question

I've got a string of data that have random CRLF inserted in the lines which I need to remove and proper CRLF ending the data which I need to keep.

I've tried using Notepad++ regex trying to replace the following with empty: [^NULL]\r\n

However, it does not remove the inserted CRLFs. Any thoughts on how best to use this in Notepad++?

Inserted CRLF

Proper ending CRLF

Answer 1

This will replace every linebreak that is not preceeded by "NULL".

---

• Ctrl+H
• Find what: (?<!NULL)\R
• Replace with: # a space OR any thing you want that will replace the linebreak
• CHECK Wrap around
• CHECK Regular expression
• Replace all

Explanation:

(?<!            # negative lookbehind, make sure we haven't before:
    NULL            # literally NULL
)               # end lookbehind
\R              # any kind of linebreak (i.e. \r or \n or \r\n)

Screenshot (before):

Screenshot (after):

Answer 2

Not sure if this is exactly what you mean, but you can use the Extended search mode to match \r\n specifically.

Find what: NULL\r\n
Replace with:

Before:

After: