Erro Função preg_match()

Olá, estou tento o seguindo erro quando tento entrar no parte de administração do meu site, antes era usava o função ereg() ai alterei para preg_match() e estou com esse erro

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Warning: preg_match(): Delimiter must not be alphanumeric or backslash in /home/u981870588/public_html/admin/protecao/interface.php on line 29 Warning: preg_match(): Delimiter must not be alphanumeric or backslash in /home/u981870588/public_html/admin/protecao/interface.php on line 29 Warning: preg_match(): Delimiter must not be alphanumeric or backslash in /home/u981870588/public_html/admin/protecao/interface.php on line 29 Warning: preg_match(): Delimiter must not be alphanumeric or backslash in /home/u981870588/public_html/admin/protecao/interface.php on line 38 Warning: preg_match(): Delimiter must not be alphanumeric or backslash in /home/u981870588/public_html/admin/protecao/interface.php on line 38 Warning: preg_match(): Delimiter must not be alphanumeric or backslash in /home/u981870588/public_html/admin/protecao/interface.php on line 38

<?PHP

// ------ create table variable ------

// variables for Netscape Navigator 3 & 4 are +4 for compensation of render errors $Browser_Type = strtok($HTTP_ENV_VARS['HTTP_USER_AGENT'], "/"); if ( preg_match( "MSIE", $HTTP_ENV_VARS['HTTP_USER_AGENT']) || preg_match( "Mozilla/5.0", $HTTP_ENV_VARS['HTTP_USER_AGENT']) || preg_match ("Opera/5.11", $HTTP_ENV_VARS['HTTP_USER_AGENT']) ) { $theTable = 'WIDTH="400" HEIGHT="245"'; } else {

	$theTable = 'WIDTH="400" HEIGHT="245"';
}

echo $HTTP_ENV_VARS["QUERY_STRING"];

// ------ create document-location variable ------
if ( preg_match("php\.exe", $HTTP_SERVER_VARS['PHP_SELF']) || preg_match("php3\.cgi", $HTTP_SERVER_VARS['PHP_SELF']) || preg_match("phpts\.exe", $HTTP_SERVER_VARS['PHP_SELF']) ) {
$documentLocation = $HTTP_ENV_VARS['PATH_INFO'];
} else {

	$documentLocation = $HTTP_SERVER_VARS['PHP_SELF'];
}
if ( $HTTP_ENV_VARS['QUERY_STRING'] ) {
	$documentLocation .= "?" . $HTTP_ENV_VARS['QUERY_STRING'];
}
include("../config.php");

?>