Example: doris peggy -- matches captions containing both "doris" and "peggy";
Example: doris/peggy -- matches captions containing either "doris" or "peggy";
Example: doris peggy/iris/huguette -- matches captions containing doris and at least one of peggy, iris, or huguette;
Example: hadashville may1 -- matches photos taken near Hadashville in mid-May (may10, may11... or may19);
Example: 04060_ -- matches photo number 04060 (the underscore prevents matching a date);
Example: round-leaf -- matches "round-leaf" or "roundleaf" or "round leaf";
Note: the Photos by Caption page is still available, although the search capability seems to've made it obsolete.