[tuska]

Now I have one last question: Button “Extract” in the “Find”-window:
☑ Use Output Bar | Extract Options: Display File Names and Lines

Example:
9
09
2
4
24
42
123
5467
—-
◉ Regular Expressions: (?<![0-9])[24](?![0-9])
Klick on button “Find Next” and then on “Extract” brings “Output”:

“(?<![0-9])[24](?![0-9])” Untitled-3

Untitled-3(4): 2
Untitled-3(5): 4

Test: OK
—-
◉ (None) – ☑ Multiline
Same example: 2 Ctrl+enter, 4 Ctrl+enter
Klick on button “Find Next” and then on “Extract” brings “Output”:

“2
4
” Untitled-3

Untitled-3(4): 2

Untitled-3(5): 4 seems to be missing for me in “Output”-box
—-
◉ Escape Sequence – without Multiline
Same example: 2\n4\n
Klick on button “Find Next” and then on “Extract” brings “Output”:

“2\n4\n” Untitled-3

Untitled-3(4): 2

Untitled-3(5): 4 seems to be missing for me in “Output”-box
—-
With the remaining three options in “Extract Options…” I suspect partially similar combinations,
i.e. only a partial output in the “Output” box.
—-
For me there would be one line missing in the “Output” box in the example above.
Can someone please confirm this or tell me how to understand this constellation?