I use C-s to search for a string. All matches are highlighted. Then I would like to scroll down by C-v, but all matches disappear.
I know keeping C-s will move to the next match, but it is too slow. How shall I do then? Thanks.
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@legosia's answer is the usual one, and probably what you want. But be aware that there is an alternative Isearch behavior that lets you scroll the buffer being searched without exiting Isearch.
If you set (or bind) option
isearch-allow-scroll to non-nil then you can scroll without exiting Isearch, as long as the current match is still on screen.
This has the advantage that you can continue to see the set of matches highlighted. The current context is maintained while you scroll.
Few are aware of this option, and probably fewer still make use of it.
Some more info about
In addition to allowing scrolling, non-nil
isearch-allow-scroll also has the effect of non-nil option
isearch-allow-prefix (available starting with Emacs 24.4). That is, it lets you pass a prefix argument to a command that is bound to a key in
isearch-mode-map. So to use a prefix argument you must set either
isearch-allow-prefix (if available) to non-nil. Otherwise, a prefix arg during Isearch exits Isearch.
Some Isearch enhancements, such as Isearch+, bind keys that let you make use of a prefix argument for various actions during Isearch.