Scans string for matches to pattern, then replaces the matched text with replacement
The regular expression pattern.
Multibyte characters may be used in pattern.
The replacement text.
The string being checked.
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 resultant string on success, or FALSE on error.
The internal encoding or the character encoding specified by mb_regex_encoding() will be used as the character encoding for this function.
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