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Multiline
Toggles between singleline and multiline of the drop-down list box (this command appears only in the Find dialog box and Replace dialog box).
In a Regex string, a n is a newline.
As well as rn e.g. CRLF
The fact that my regex is a “single line string” is irrelevant. It contains multiple n newlines, and if you want it to work as intended —- which is to look on multiple lines for search matches/input, then you need to select “Multiline” from the dialog, as I mentioned previously.