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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.
Matching condition can be set by option parameter. If i is specified for this parameter, the case will be ignored. If x is specified, white space will be ignored. If m is specified, match will be executed in multiline mode and line break will be included in '.'. If p is specified, match will be executed in POSIX mode, line break will be considered as normal character. If e is specified, replacement string will be evaluated as PHP expression.
The internal encoding or the character encoding specified in mb_regex_encoding() will be used as character encoding.
See also: mb_regex_encoding(), mb_eregi_replace().