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mb_ereg_search_getpos() returns the point to start regular expression match for mb_ereg_search(), mb_ereg_search_pos(), mb_ereg_search_regs(). The position is represented by bytes from the head of string.
The internal encoding or the character encoding specified in mb_regex_encoding() will be used as character encoding.
See also: mb_regex_encoding(), mb_ereg_search_setpos().