(PHP 4 >= 4.3.0, PHP 5)
mb_regex_set_options — Set/Get the default options for mbregex functions
mb_regex_set_options() sets the default options described by options for multibyte regex functions.
Returns the previous options. If options is omitted, it returns the string that describes the current options.
See also mb_split(), mb_ereg() and mb_eregi()