I found a good way to use a multi-line "find" or "replace". I just copy pasted the paragraph into the Ctrl+H
"find" field, then brought another paragraph and pasted it into the "replace" field. Notepad++ will show a tabbed space that means a line break. And voila, you can "Replace in all open documents" with just a single click.
N.B.: the "copy" operation should be within Notepad++, otherwise it would paste only the first line in either fields.
Update:
To be clearer about my answer, i found out that Notepad++ will let me only Paste once. That means, if i Copy a paragraph, i can paste it WITH its line break in the "find" field for example but if i paste it another time in the replace field, it will paste only the first line. Hence, no more than 1 "paste" operation is allowed into the Ctrl+H
box in case i want to "paste" the line break.
So, in order for this to be done, first, i select any text i want and Ctrl+C
on it, then, i go for the paragraph to be found, i just "Select" it and hit Ctrl+H
: Notepad++ automatically shows the already selected text into the "find" field. Secondly, we "Paste" the text that's already in our clipboard into the "Replace" field. And the line breaks are here!
In brief: Select text --> Ctrl+C
--> Select text --> Ctrl+H
--> Ctrl+V
in "replace field"