Xpath如何实现精确匹配和模糊匹配百度推广信息
- 作者：zhanhy ——来源：原创 ——Xpath经常用到的地方是爬虫软件，一般在爬去数据时使用可以快速高效精确的定位到要爬取的数据。在使用过程中有时我们需要精确匹配节点，有时需要模糊匹配节点信息，具体如何做可以实现精确匹配和模糊匹配呢。这里来实际举例下Xpath如何实现精确匹配和模糊匹配百度推广信息，希望可以给你带来帮助。
百度搜索结果和搜索词如下图所示，搜索结果源码参考下方部分源码，目的是为了获取到推广标题和推广简介，要实现目的需要先用xpath获取数据所在的区域代码，之后从区域代码中再次提取到推广标题和推广简介。
部分代码如下（为了视觉效果更好，链接地址已经缩短，如果需要获取链接地址的话，可以自行修改语句）：
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多样课程
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<!-- pc jieou new -->通过分析上面的代码后，不难发现所有的推广信息都会放在一个div里面，这个div里面包含属性id和属性cmatchid，而其它正常的搜索结果不会同时带有这两个属性。那么Xpath语句就可以这么写：//div[@id and @cmatchid]，注意该语句不会管属性值是什么内容，只要包含属性即可。
当然如果只需要匹配推广标题的话，可以使用模糊匹配Xpath语句：//h3[contains(@class,"t ")]
如果只需要匹配摘要可以使用精确匹配Xpath语句：//div[@class=""]/a/text()。
如果要获取标题和简介，仍然需要先获取区域后再从区域内获取标题和简介，这样做的目的是为了防止数据错行。如果你还有别的问题，可以留言咨询。
如果你还有其它疑问可以来本站搜索相关问题，这里会有你想要的答案：火车脚本网
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- zhanhy 评论 Xpath如何实现精确匹配：东西很有用，感谢分享。如果要匹配文本内容，可以使用相应的
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