Override the 'ignorecase' option if the search pattern contains upper case characters. Only used when the search pattern is typed and 'ignorecase' option is on. Used for the commands "/", "?", "n", "N", ":g" and ":s". Not used for "", "#", "gd", tag search, etc. After "" and "#" you can make 'smartcase' used by doing a "/" command, recalling the search pattern from history and hitting . NOTE: This option is reset when 'compatible' is set.