正则表达式求指教

heiyahua · 发表于 2023-3-23 19:48

本帖最后由 heiyahua 于 2023-3-24 10:28 编辑

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      查看Linux系统的磁盘列表，并以K或G字节为单位显示磁盘容量的指令是：
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上边的是源码，选择题第一题有ABCD四个选项，第二题有ABC三个选项，其余题目可能会有ABCDEF五个选项，我想把题目和选项都匹配出来，请教正则表达式需要如何修改？之前使用(?:和)?仍然没有效果
partten_timu = f'<span><a class="normal" name="{list_bianma[j]}">({list_xuhao[j]})、</a></span>\s       (.*?)\s </div>\s\s</div>\s <div.+?<span class="pull-left option-num">(A).</span>\s' \
               f'             <div class="answer-options m-left">(.*?)</div.+?             <span class="pull-left option-num">(B).</span>\s             <div class="answer-options m-left">(.*?)</div.+?' \
               f'             <span class="pull-left option-num">(C).</span>\s             <div class="answer-options m-left">(.*?)</div.+?' \
               f'             <span class="pull-left option-num">(D).</span>\s             <div class="answer-options m-left">(.*?)</div.+?' \
               f'             <span class="pull-left option-num">(E).</span>\s             <div class="answer-options m-left">(.*?)</div.+?' \
               f'             <span class="pull-left option-num">(F).</span>\s             <div class="answer-options m-left">(.*?)</div'

正则表达式需要把选择题的ABCD选项匹配出来，但是有个别题目会有EF选项。上边的正则表达式去掉最后两行后可以运行但是会缺少部分选项，加上最后两行之后又无法匹配全部题目，求教应该怎么修改？

han5562877 · 发表于 2023-3-23 22:47

本帖最后由 han5562877 于 2023-3-23 22:52 编辑

使用正则表达式的可选分组，应该改为这样

partten_timu = f'<span><a class="normal" name="{list_bianma[j]}">({list_xuhao[j]})、</a></span>\s        (.*?)\s    </div>\s\s</div>\s    <div.+?<span class="pull-left option-num">(A).</span>\s' \
               f'                <div class="answer-options m-left">(.*?)</div.+?                <span class="pull-left option-num">(B).</span>\s                <div class="answer-options m-left">(.*?)</div.+?' \
               f'                <span class="pull-left option-num">(C).</span>\s                <div class="answer-options m-left">(.*?)</div.+?' \
               f'                <span class="pull-left option-num">(D).</span>\s                <div class="answer-options m-left">(.*?)</div.+?' \
               f'(?:             <span class="pull-left option-num">(E).</span>\s                <div class="answer-options m-left">(.*?)</div.+?)?' \
               f'(?:             <span class="pull-left option-num">(F).</span>\s                <div class="answer-options m-left">(.*?)</div)?'

分组前面加上了(?:和)?用来变成可选

tl;dr · 发表于 2023-3-24 07:09

提示: 作者被禁止或删除内容自动屏蔽

jetty1986 · 发表于 2023-3-24 07:54

好久不弄了，有点生疏了

fengrui99 · 发表于 2023-3-24 08:24

学习一下

小屎球 · 发表于 2023-3-24 08:37

如果是爬虫建议用xpath,如果是模板渲染建议用for循环

zdnyp · 发表于 2023-3-24 09:33

你能把问题提好不

你甚至不贴源代码

c13950143096 · 发表于 2023-3-24 09:36

r'<div class="answer-options m-left">\s+(.*?)\s+</div>'
该正则表达式主要作用是匹配包含选项（abcdef）的 <div> 标签，并且通过捕获组 (.*?) 来获取选项文本。其中 \s+ 表示匹配一个或多个空白字符， (.*?) 表示匹配任意字符（包括换行符），非贪婪模式，直到遇到下一个表达式。使用该正则表达式可以方便地获取题目选项。

Ta'ta · 发表于 2023-3-24 09:54

有正则表达式测试的软件，自己慢慢试一下用哪个表达式，好久没用我都忘记了

bobo2017365 · 发表于 2023-3-24 10:11

那就分几步走呗，第一步提取所有答案，分别存放到字符串，第二步拼接这些字符串

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[求助] 正则表达式求指教

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