Set the current character search information to {dict}, which contains one or more of the following entries:

char        character which will be used for a subsequent
            `,` or `;` command; an empty string clears the
            character search
forward     direction of character search; 1 for forward,
            0 for backward
until       type of character search; 1 for a `t` or `T`
            character search, 0 for an `f` or `F`
            character search

This can be useful to save/restore a user's character search from a script:

:let prevsearch = getcharsearch()
:" Perform a command which clobbers user's search
:call setcharsearch(prevsearch)

Also see getcharsearch().

Can also be used as a method:

SavedSearch()->setcharsearch()