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WordPress データベースエラー: [Got error 'empty (sub)expression' from regexp]
SELECT SQL_CALC_FOUND_ROWS wp_posts.ID FROM wp_posts INNER JOIN wp_postmeta ON ( wp_posts.ID = wp_postmeta.post_id ) WHERE 1=1 AND ( ( wp_postmeta.meta_key = 'ギャラリーカテゴリ' AND wp_postmeta.meta_value REGEXP '' ) ) AND wp_posts.post_type = 'attachment' GROUP BY wp_posts.ID ORDER BY wp_posts.post_date DESC LIMIT 0, 52