If there are some maches, the first element will have the matched sub-string, the second element will have the first part grouped with brackets, the third element will have the second part grouped with brackets, and so on.
mb_ereg_search_getregs() returns an array including the sub-string of matched part by last mb_ereg_search(), mb_ereg_search_pos(), mb_ereg_search_regs(). If there are some maches, the first element will have the matched sub-string, the second element will have the first part grouped with brackets, the third element will have the second part grouped with brackets, and so on. It returns FALSE on error;