1．编写爬虫程序到互联网上抓取网页海量的网页。

　　2．将抓取来的网页通过抽取，以一定的格式保存在能快速检索的文件系统中。

　　3．把用户输入的字符串进行拆分成关键字去文件系统中查询并返回结果。

　　由以上3点可见，字符串的分析，抽取在搜索引擎中的地位是何等重要。

-1. Write a crawler to crawl the Web massive Internet pages. 2. Will crawl to the pages by extracting, saved in the file system can be quickly retrieved in a certain format. 3. User input string split into keywords to the file system query and returns the result. Visible by more than 3 points, the analysis of the string, the decimation of status in the search engine how important it is.