- string-cursor-backprocedure
Returns the cursor into s which follows/precedes cursor by nchars characters. If cursor is an index, returns nchars more/less than cursor. It is an error if the result would be an invalid cursor or index.
Returns the cursor into s which follows/precedes cursor by nchars characters. If cursor is an index, returns nchars more/less than cursor. It is an error if the result would be an invalid cursor or index.