Here’s how you’d do it on a Mac:
Command+F > type string > Control+Command+G > ESC > Right Arrow > line break
and Windows/Linux (untested):
Control+F > type string > Alt+F3 > ESC > Right Arrow > line break
The important part being Control+Command+G to select all matches.
Once you’ve selected the text you’re looking for, you can use the provided multiple cursors to do whatever text manipulation you want.
Protip: you can manually instantiate multiple cursors by using Command+click (or Control+click) to achieve similar results.