[已解决]正则问题请高手帮忙

jjxx2005 · 发表于 2020-4-14 16:45:26

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import requests
import re

if __name__ == "__main__":
    url = 'http://www.jkl.com.cn/cn/phoLis.aspx?id=697'
    headers = {'user-agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.92 Safari/537.36'}
    # 使用通过爬虫对url对应的一整张页面进行爬取
    page_text = requests.get(url=url,headers=headers).text
    # 使用聚焦爬虫将页面中所有的图片进行解析/提取
    img_src_list = re.findall(r'(?<=\<img src\=").+(?=" width)',page_text,re.S)
    print(img_src_list)

打印的列表不是我想要的，我想要的是以上我想把所有的<img src= 和 width 之间的jpg地址提取出来

我把正则写成 '<div id="list" class="proLis">.*?<img src="(.*?)" width.*?<div class="clear">' 只能提取出第一个，按上面的写提取出来的又多了好多不是我要的

最佳答案

月排行榜 / 总排行榜

悠悠2264

2020-4-14 17:21:23

本帖最后由悠悠2264 于 2020-4-14 17:29 编辑

这下可以了，去掉re.S，这变成.+?（匹配最近一个）。不使用re.S参数，则只在每一行内进行匹配，如果一行没有，就换下一行重新开始。如果不去掉，就有可能从这一行前面的<img src\="进行匹配

import requests
import re

if __name__ == "__main__":
    url = 'http://www.jkl.com.cn/cn/phoLis.aspx?id=697'
    headers = {'user-agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.92 Safari/537.36'}
    # 使用通过爬虫对url对应的一整张页面进行爬取
    page_text = requests.get(url=url,headers=headers).text
    # 使用聚焦爬虫将页面中所有的图片进行解析/提取
    img_src_list = re.findall(r'(?<=\<img src\=").+?(?=" width\="165" height\="117")',page_text)
    print(img_src_list)

跳转到最佳答案楼层

悠悠2264 · 发表于 2020-4-14 16:56:23

本帖最后由悠悠2264 于 2020-4-14 17:01 编辑

把爬取到的东西和不需要的东西发出来

jjxx2005 · 发表于 2020-4-14 17:05:32

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                                 第20015期——6页</span></a></li>

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                              <img src="/UserFiles/海报202003/20015/7-16065238657.jpg" width="165" height="117" /><br />
                              <span>
                                 第20015期——7页</span></a></li>

                        <li><a  href="/UserFiles/海报202003/20015/8-16065292259.jpg" target="_blank" >
                              <img src="/UserFiles/海报202003/20015/8-16065292259.jpg" width="165" height="117" /><br />
                              <span>
                                 第20015期——8页</span></a></li>

                        <li><a  href="/UserFiles/海报202003/20015/9-15511861021.jpg" target="_blank" >
                              <img src="/UserFiles/海报202003/20015/9-15511861021.jpg" width="165" height="117" /><br />
                              <span>
                                 第20015期——9页</span></a></li>

                        <li><a  href="/UserFiles/海报202003/20015/10-15511930680.jpg" target="_blank" >
                              <img src="/UserFiles/海报202003/20015/10-15511930680.jpg" width="165" height="117" /><br />
                              <span>
                                 第20015期——10页</span></a></li>

                        <li><a  href="/UserFiles/海报202003/20014/1-08081927870.jpg" target="_blank" >
                              <img src="/UserFiles/海报202003/20014/1-08081927870.jpg" width="165" height="117" /><br />
                              <span>
                                 第20014期——1页</span></a></li>

                        <li><a  href="/UserFiles/海报202003/20014/2-08082011487.jpg" target="_blank" >
                              <img src="/UserFiles/海报202003/20014/2-08082011487.jpg" width="165" height="117" /><br />
                              <span>
                                 第20014期——2页</span></a></li>

            </ul>
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      theForm.__EVENTTARGET.value = eventTarget;
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      document.getElementById("697").className = 'hover';
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我只想提取红色的内容

悠悠2264 · 发表于 2020-4-14 17:08:45

可以发现只有这些图片链接的后面是width="165" height="117"，所以可以根据这个，代码如下：

import requests
import re

if __name__ == "__main__":
    url = 'http://www.jkl.com.cn/cn/phoLis.aspx?id=697'
    headers = {'user-agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.92 Safari/537.36'}
    # 使用通过爬虫对url对应的一整张页面进行爬取
    page_text = requests.get(url=url,headers=headers).text
    # 使用聚焦爬虫将页面中所有的图片进行解析/提取
    img_src_list = re.findall(r'(?<=\<img src\=").+(?=" width="165" height="117")',page_text,re.S)
    print(img_src_list)

jjxx2005 · 发表于 2020-4-14 17:14:46

悠悠2264 发表于 2020-4-14 17:08
可以发现只有这些图片链接的后面是width="165" height="117"，所以可以根据这个，代码如下：

朋友这个不行，您再帮我看看

他返回的是 ['images/logo.jpg" width="182" height="50" /></a></div>\r\n <div class="nav">\r\n <ul id="nav">\r\n <li><a href="index.aspx" class="nav01">网站首页</a></li>\r\n <li><a href="about.aspx" class="nav02">集团信息</a>\r\n <ul class="ul01">\r\n <li class="li_left"></li>\r\n \r\n <li><a href="about.aspx?id=682">\r\n 集团简介</a></li>\r\n \r\n <li><a href="about.aspx?id=705">\r\n 董事长致辞</a></li>\r\n \r\n <li><a href="about.aspx?id=730">\r\n 成长历程</a></li>\r\n \r\n <li><a href="about.aspx?id=731">\r\n 企业文化</a></li>\r\n \r\n <li><a href="about.aspx?id=750">\r\n 集团子公司</a></li>\r\n \r\n <li><a href="about.aspx?id=751">\r\n 集团新闻</a></li>\r\n \r\n <li class="li_right"></li>\r\n </ul>\r\n </li>\r\n <li id="li03"><a href="invest.aspx" class="nav03">投资者关系</a>\r\n <ul class="ul02">\r\n <li class="li_left"></li>\r\n \r\n <li><a href="invest.aspx?id=890">\r\n 公告及通告</a></li>\r\n \r\n <li><a href="invest.aspx?id=888">\r\n 财务资料</a></li>\r\n \r\n <li><a href="invest.aspx?id=889">\r\n 企业推介材料</a></li>\r\n \r\n <li><a href="invest.aspx?id=891">\r\n 通函</a></li>\r\n \r\n <li><a href="invest.aspx?id=892">\r\n 企业管治</a></li>\r\n \r\n <li><a href="invest.aspx?id=893">\r\n 招股书/上市文件</a></li>\r\n \r\n <li><a href="invest.aspx?id=894">\r\n 上市规则下提交之披露...</a></li>\r\n \r\n <li><a href="invest.aspx?id=923">\r\n 公司联络资料</a></li>\r\n \r\n <li><a href="invest.aspx?id=934">\r\n 重要招租公告</a></li>\r\n \r\n <li class="li_right"></li>\r\n </ul>\r\n </li>\r\n <li><a href="phoLis.aspx" class="nav05">促销信息</a>\r\n <ul class="ul04">\r\n <li class="li_left"></li>\r\n \r\n <li><a href="phoLis.aspx?id=697">\r\n 电子海报</a></li>\r\n \r\n <li><a href="phoLis.aspx?id=757">\r\n 主推商品</a></li>\r\n \r\n <li><a href="phoLis.aspx?id=759">\r\n 会员促销</a></li>\r\n \r\n <li class="li_right"></li>\r\n </ul>\r\n </li>\r\n <li><a href="serLis.aspx" class="nav06">便民服务</a>\r\n <ul class="ul05">\r\n <li class="li_left"></li>\r\n \r\n <li><a href="serLis.aspx?id=706">\r\n 商品知识</a></li>\r\n \r\n <li><a href="serLis.aspx?id=761">\r\n 健康养生</a></li>\r\n \r\n <li><a href="serLis.aspx?id=882">\r\n 多用途预付卡</a></li>\r\n \r\n <li><a href="serLis.aspx?id=762">\r\n 便民服务项目</a></li>\r\n \r\n <li><a href="serLis.aspx?id=932">\r\n 公司债券发行人规范运...</a></li>\r\n \r\n <li class="li_right"></li>\r\n </ul>\r\n </li>\r\n <li id="li06"><a href="food.aspx" class="nav04">招商信息</a>\r\n <ul class="ul03">\r\n <li class="li_left"></li>\r\n \r\n <li><a href="food.aspx?id=737">\r\n 店铺广告位招租</a></li>\r\n \r\n <li><a href="food.aspx?id=931">\r\n 京客隆集团招商信息</a></li>\r\n \r\n <li><a href="food.aspx?id=738">\r\n 诚招知名品牌商户</a></li>\r\n \r\n <li><a href="food.aspx?id=883">\r\n 寻租寻购商业用房</a></li>\r\n \r\n <li class="li_right"></li>\r\n </ul>\r\n </li>\r\n </ul>\r\n\r\n <script type="text/javascript"> menu()</script>\r\n\r\n </div>\r\n <div class="clear">\r\n </div>\r\n</div>\r\n\r\n <div class="info_banner">\r\n <img src="/UserFiles/about_banner-11261421337.jpg" width="982" height="139" /></div>\r\n <div class="infoBox">\r\n <div class="infoL">\r\n \r\n<div class="infoLis">\r\n \t<h5><img src="images/tit4.jpg" /></h5>\r\n <ul>\r\n \r\n <li><a href="phoLis.aspx?id=697" id="697">电子海报</a></li>\r\n \r\n <li><a href="phoLis.aspx?id=757" id="757">主推商品</a></li>\r\n \r\n <li><a href="phoLis.aspx?id=759" id="759">会员促销</a></li>\r\n \r\n \r\n </ul>\r\n </div>\r\n \r\n<div class="tel">\r\n \t<p><a href="contact.aspx"><img src="images/contact.jpg" /></a></p>\r\n <p><a href="serLis.aspx"><img src="images/ser.jpg" /></a></p>\r\n <div style="margin-top:10px;"><span style="float:left;">分享到：</span><div class="bshare-custom"><div class="bsPromo bsPromo2"></div><a class="bshare-qzone" title="分享到QQ空间"></a><a class="bshare-sinaminiblog" title="分享到新浪微博"></a><a class="bshare-renren" title="分享到人人网"></a><a class="bshare-qqmb" title="分享到腾讯微博"></a><a class="bshare-neteasemb" title="分享到网易微博"></a><a class="bshare-more bshare-more-icon more-style-addthis" title="更多平台"></a></div><script type="text/javascript" charset="utf-8" src="http://static.bshare.cn/b/buttonLite.js#style=-1&uuid=&pophcol=2&lang=zh"></script><script type="text/javascript" charset="utf-8" src="http://static.bshare.cn/b/bshareC0.js"></script></div>\r\n </div>\r\n </div>\r\n <div class="infoR">\r\n <div class="infoTit">\r\n 电子海报<span>当前位置：<a href="index.aspx" class="homes">首页</a> > <a href="phoLis.aspx">\r\n 促销信息</a> > <strong>\r\n 电子海报</strong></span></div>\r\n \r\n <div id="list" class="proLis">\r\n <ul>\r\n \r\n <li><a href="/UserFiles/海报202003/20015/1-15510642492.jpg" target="_blank" >\r\n <img src="/UserFiles/海报202003/20015/1-15510642492.jpg" width="165" height="117" /><br />\r\n <span>\r\n 第20015期——1页</span></a></li>\r\n \r\n <li><a href="/UserFiles/海报202003/20015/2-15510669440.jpg" target="_blank" >\r\n <img src="/UserFiles/海报202003/20015/2-15510669440.jpg" width="165" height="117" /><br />\r\n <span>\r\n 第20015期——2页</span></a></li>\r\n \r\n <li><a href="/UserFiles/海报202003/20015/3-15510869153.jpg" target="_blank" >\r\n <img src="/UserFiles/海报202003/20015/3-15510869153.jpg" width="165" height="117" /><br />\r\n <span>\r\n 第20015期——3页</span></a></li>\r\n \r\n <li><a href="/UserFiles/海报202003/20015/4-15511145698.jpg" target="_blank" >\r\n <img src="/UserFiles/海报202003/20015/4-15511145698.jpg" width="165" height="117" /><br />\r\n <span>\r\n 第20015期——4页</span></a></li>\r\n \r\n <li><a href="/UserFiles/海报202003/20015/5-15512595833.jpg" target="_blank" >\r\n <img src="/UserFiles/海报202003/20015/5-15512595833.jpg" width="165" height="117" /><br />\r\n <span>\r\n 第20015期——5页</span></a></li>\r\n \r\n <li><a href="/UserFiles/海报202003/20015/6-16065175196.jpg" target="_blank" >\r\n <img src="/UserFiles/海报202003/20015/6-16065175196.jpg" width="165" height="117" /><br />\r\n <span>\r\n 第20015期——6页</span></a></li>\r\n \r\n <li><a href="/UserFiles/海报202003/20015/7-16065238657.jpg" target="_blank" >\r\n <img src="/UserFiles/海报202003/20015/7-16065238657.jpg" width="165" height="117" /><br />\r\n <span>\r\n 第20015期——7页</span></a></li>\r\n \r\n <li><a href="/UserFiles/海报202003/20015/8-16065292259.jpg" target="_blank" >\r\n <img src="/UserFiles/海报202003/20015/8-16065292259.jpg" width="165" height="117" /><br />\r\n <span>\r\n 第20015期——8页</span></a></li>\r\n \r\n <li><a href="/UserFiles/海报202003/20015/9-15511861021.jpg" target="_blank" >\r\n <img src="/UserFiles/海报202003/20015/9-15511861021.jpg" width="165" height="117" /><br />\r\n <span>\r\n 第20015期——9页</span></a></li>\r\n \r\n <li><a href="/UserFiles/海报202003/20015/10-15511930680.jpg" target="_blank" >\r\n <img src="/UserFiles/海报202003/20015/10-15511930680.jpg" width="165" height="117" /><br />\r\n <span>\r\n 第20015期——10页</span></a></li>\r\n \r\n <li><a href="/UserFiles/海报202003/20014/1-08081927870.jpg" target="_blank" >\r\n <img src="/UserFiles/海报202003/20014/1-08081927870.jpg" width="165" height="117" /><br />\r\n <span>\r\n 第20014期——1页</span></a></li>\r\n \r\n <li><a href="/UserFiles/海报202003/20014/2-08082011487.jpg" target="_blank" >\r\n <img src="/UserFiles/海报202003/20014/2-08082011487.jpg']

jjxx2005 · 发表于 2020-4-14 17:15:57

悠悠2264 发表于 2020-4-14 17:08
可以发现只有这些图片链接的后面是width="165" height="117"，所以可以根据这个，代码如下：

我的目的是就让它返回

['/xxxxxxx.jpg','/xxxxxxx.jpg',.....]

jjxx2005 · 发表于 2020-4-14 17:17:00

悠悠2264 发表于 2020-4-14 17:08
可以发现只有这些图片链接的后面是width="165" height="117"，所以可以根据这个，代码如下：

我的正则是
'<div id="list" class="proLis">.*?<img src="(.*?)" width.*?<div class="clear">'
写的

但是只能抓到第一个jpg

悠悠2264 · 发表于 2020-4-14 17:21:23

本帖最后由悠悠2264 于 2020-4-14 17:29 编辑

这下可以了，去掉re.S，这变成.+?（匹配最近一个）。不使用re.S参数，则只在每一行内进行匹配，如果一行没有，就换下一行重新开始。如果不去掉，就有可能从这一行前面的<img src\="进行匹配

import requests
import re

if __name__ == "__main__":
    url = 'http://www.jkl.com.cn/cn/phoLis.aspx?id=697'
    headers = {'user-agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.92 Safari/537.36'}
    # 使用通过爬虫对url对应的一整张页面进行爬取
    page_text = requests.get(url=url,headers=headers).text
    # 使用聚焦爬虫将页面中所有的图片进行解析/提取
    img_src_list = re.findall(r'(?<=\<img src\=").+?(?=" width\="165" height\="117")',page_text)
    print(img_src_list)

jjxx2005 · 发表于 2020-4-14 17:29:22

悠悠2264 发表于 2020-4-14 17:21
这下可以了，去掉re.S，这变成.+?（匹配最近一个）。不使用re.S参数，则只在每一行内进行匹配，如果一行没 ...

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