Regexp OR query

$meta_query = array(
	'relation' => 'OR',
	array(
		'key'     => 'sp_officials',
		'value'   => 'savvas',
		'compare' => 'REGEXP',
	),
	array(
		'key'     => 'sp_officials',
		'value'   => 'a:\d+:{.*i:15;a:\d+:{.*\"5968\".*}.*}',
		'compare' => 'REGEXP',
	),
);