php man page for mb_regex_encoding

MB_REGEX_ENCODING(3)							 1						      MB_REGEX_ENCODING(3)

mb_regex_encoding - Set/Get character encoding for multibyte regex

SYNOPSIS
       mixed mb_regex_encoding ([string  $encoding = mb_regex_encoding()])

DESCRIPTION
	Set/Get character encoding for a multibyte regex.

PARAMETERS
	      o $encoding
		-The $encoding parameter is the character encoding. If it is omitted, the internal character encoding value will be used.

RETURN VALUES
	If  $encoding  is  set, then Returns TRUE on success or FALSE on failure. In this case, the internal character encoding is NOT changed. If
       $encoding is omitted, then the current character encoding name for a multibyte regex is returned.

SEE ALSO
       mb_internal_encoding(3), mb_ereg(3).

PHP Documentation Group 												      MB_REGEX_ENCODING(3)