DELETE FROM [table] where First_Name REGEXP '[^a-zA-Z0-9- ]' OR Last_Name REGEXP '[^a-zA-Z0-9- ]' OR Company REGEXP '[^a-zA-Z0-9-& ]' OR website NOT REGEXP '^(https?://|www\\.)[\.A-Za-z0-9\-]+\\.[a-zA-Z]{2,4}' OR Email NOT REGEXP '^[A-Z0-9._%-]+@[A-Z0-9.-]+\.[A-Z]{2,4}$';