mb_ereg_replace() scans string for matches to pattern, then replaces the matched text with replacement and returns the result string or FALSE on error. Multibyte character can be used in pattern. The case will be ignored. option has the same meaning as in mb_ereg_replace().
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_replace().