keyword search
$meta_query = array( array( 'key' => 'wp_wiper_search_keyword', 'value' => '2018', 'compare' => 'REGEXP', 'type' => 'CHAR', ), );
$meta_query = array( array( 'key' => 'wp_wiper_search_keyword', 'value' => '2018', 'compare' => 'REGEXP', 'type' => 'CHAR', ), );