⌘ F opens the find bar over the focused pane and searches its whole
scrollback, not just the visible screen.
⏎ · ⌘ G
Next match
⇧ ⏎ · ⌘ ⇧ G
Previous match
Esc
Close the find bar
Two toggles sit in the bar:
Match case — off by default, so a lowercase query matches anything.
Use regular expression — the query becomes a regex. An invalid pattern is
shown as an error rather than silently matching nothing.
Matches are highlighted in place and the view scrolls to each one as you step
through. On Windows and Linux the shortcuts are Ctrl ⇧ F to open,
F3 and ⇧ F3 to step.
Placeholder — screenshot: the find bar with matches highlighted in the scrollback
How much there is to search is Settings → Terminal → Scrolling →
Scrollback — 10,000 lines per pane by default, up to 100,000. The change
applies to new panes.