详细说明：perl实现的一个爬虫程序，程序虽小，但是短小精干。可以使用正则表达式来限定爬行范围-achieve a reptile procedure is small, but small and lean. It is the use of regular expressions to limit the scope of crawling.

测试获取百度的搜索结果，利用正则表达式匹配内容-Testing Gets Baidu search results, use regular expressions to match content