从 <li> HTML 正文标记中检索超链接值？

我需要通过正则表达式获取 HTML 正文标记中的 href 值

<html>
<head>
</head>
<body class="directory">
<input id="search" type="text" placeholder="Search" autocomplete="off" />
<div id="wrapper">
<h1><a href="/">~</a> / <a href="/public">public</a> / <a href="/public/img">img</a> / <a href="/public/img/events">events</a> / <a href="/public/img/events/poster">poster</a> / </h1>
<ul id="files" class="view-tiles"><li><a href="/public/img/events" class="" title=".."><span class="name">..</span><span class="size"></span><span class="date"></span></a></li>
<li><a href="/public/img/events/poster/2018-09-26-1.PNG" class="" title="2018-09-26-1.PNG"><span class="name">2018-09-26-1.PNG</span><span class="size">1406471</span><span class="date">2018-9-16 18:37:23</span></a></li>
<li><a href="/public/img/events/poster/2018-09-26-2.PNG" class="" title="2018-09-26-2.PNG"><span class="name">2018-09-26-2.PNG</span><span class="size">530859</span><span class="date">2018-9-16 18:37:44</span></a></li>
<li><a href="/public/img/events/poster/2018-09-26-3.PNG" class="" title="2018-09-26-3.PNG"><span class="name">2018-09-26-3.PNG</span><span class="size">551409</span><span class="date">2018-9-16 18:38:24</span></a></li>
<li><a href="/public/img/events/poster/test" class="" title="test"><span class="name">test</span><span class="size">0</span><span class="date">2018-10-4 20:16:58</span></a></li></ul>
</div>
</body>
<html>

我想要一个包含以下内容的列表

/public/img/events/poster/2018-09-26-1.PNG and 
/public/img/events/poster/2018-09-26-2.PNG and
/public/img/events/poster/2018-09-26-3.PNG.

我使用的表达式：

/[<bodysclass="directory">].+[<li><ashrefs*=s*"]([^">]+)"s+[class].+[</body>]/g

但是我得到了结果：

<ul id="files" class="view-tiles"><li><a href="/public/img/events" class="" title=".."><span class="name">..</span><span class="size"></span><span class="date"></span></a></li>
<li><a href="/public/img/events/poster/2018-09-26-1.PNG" class="" title="2018-09-26-1.PNG"><span class="name">2018-09-26-1.PNG</span><span class="size">1406471</span><span class="date">2018-9-16 18:37:23</span></a></li>
<li><a href="/public/img/events/poster/2018-09-26-2.PNG" class="" title="2018-09-26-2.PNG"><span class="name">2018-09-26-2.PNG</span><span class="size">530859</span><span class="date">2018-9-16 18:37:44</span></a></li>
<li><a href="/public/img/events/poster/2018-09-26-3.PNG" class="" title="2018-09-26-3.PNG"><span class="name">2018-09-26-3.PNG</span><span class="size">551409</span><span class="date">2018-9-16 18:38:24</span></a></li>
<li><a href="/public/img/events/poster/test" class="" title="test"><span class="name">test</span><span class="size">0</span><span class="date">2018-10-4 20:16:58</span></a></li></ul>

有人可以指导我吗？

您可以使用此正则表达式：

/<li[^>]*>[^<]*<a[^>]*href="([^"]+)"/g

然后通过调用match[1]访问href="([^"]+)捕获组，如下所示(假设您使用的是 JavaScript(：

var myString = `<html>
<head>
</head>
<body class="directory">
<input id="search" type="text" placeholder="Search" autocomplete="off" />
<div id="wrapper">
<h1><a href="/">~</a> / <a href="/public">public</a> / <a href="/public/img">img</a> / <a href="/public/img/events">events</a> / <a href="/public/img/events/poster">poster</a> / </h1>
<ul id="files" class="view-tiles"><li><a href="/public/img/events" class="" title=".."><span class="name">..</span><span class="size"></span><span class="date"></span></a></li>
<li><a href="/public/img/events/poster/2018-09-26-1.PNG" class="" title="2018-09-26-1.PNG"><span class="name">2018-09-26-1.PNG</span><span class="size">1406471</span><span class="date">2018-9-16 18:37:23</span></a></li>
<li><a href="/public/img/events/poster/2018-09-26-2.PNG" class="" title="2018-09-26-2.PNG"><span class="name">2018-09-26-2.PNG</span><span class="size">530859</span><span class="date">2018-9-16 18:37:44</span></a></li>
<li><a href="/public/img/events/poster/2018-09-26-3.PNG" class="" title="2018-09-26-3.PNG"><span class="name">2018-09-26-3.PNG</span><span class="size">551409</span><span class="date">2018-9-16 18:38:24</span></a></li>
<li><a href="/public/img/events/poster/test" class="" title="test"><span class="name">test</span><span class="size">0</span><span class="date">2018-10-4 20:16:58</span></a></li></ul>
</div>
</body>
<html>`;
var myRegexp = /<li[^>]*>[^<]*<a[^>]*href="([^"]+)"/g;
match = myRegexp.exec(myString);
while (match != null) {
// matched text: match[0]
// match start: match.index
// capturing group n: match[n]
console.log(match[1])
match = myRegexp.exec(myString);
}

代码示例的功劳归功于此答案。

更新 1

作者要求包括与正文标签匹配的内容

只是好奇。如果我想限制标签中的映射范围，如何更新快递？我更新了快递如下，但没有结果。]>。>[^<]]href="([^"]+(".]*>

您可以使用正则表达式做很多事情，通常不建议使用正则表达式进行高级 html 解析。您的方法给您带来了换行符的问题，并且您希望在单个主体中匹配多个li。此外，根据 HTML 约定，<li>只允许在正文中使用。

如果要这样做，请将其分解为两个步骤并匹配

var myString = `<html>
<head>
<!-- Not valid HTML, just for testing -->
<ul id="files" class="view-tiles"><li><a href="/public/img/events" class="" title=".."><span class="name">..</span><span class="size"></span><span class="date"></span></a></li>
<li><a href="/public/img/events/poster/2018-09-26-1.PNG" class="" title="2018-09-26-1.PNG"><span class="name">2018-09-26-1.PNG</span><span class="size">1406471</span><span class="date">2018-9-16 18:37:23</span></a></li>
<li><a href="/public/img/events/poster/2018-09-26-2.PNG" class="" title="2018-09-26-2.PNG"><span class="name">2018-09-26-2.PNG</span><span class="size">530859</span><span class="date">2018-9-16 18:37:44</span></a></li>
<li><a href="/public/img/events/poster/2018-09-26-3.PNG" class="" title="2018-09-26-3.PNG"><span class="name">2018-09-26-3.PNG</span><span class="size">551409</span><span class="date">2018-9-16 18:38:24</span></a></li>
<li><a href="/public/img/events/poster/test" class="" title="test"><span class="name">test</span><span class="size">0</span><span class="date">2018-10-4 20:16:58</span></a></li></ul>
</head>
<body class="directory">
<input id="search" type="text" placeholder="Search" autocomplete="off" />
<div id="wrapper">
<h1><a href="/">~</a> / <a href="/public">public</a> / <a href="/public/img">img</a> / <a href="/public/img/events">events</a> / <a href="/public/img/events/poster">poster</a> / </h1>
<ul id="files" class="view-tiles"><li><a href="/public/img/events" class="" title=".."><span class="name">..</span><span class="size"></span><span class="date"></span></a></li>
<li><a href="/public/img/events/poster/2018-09-26-1.PNG" class="" title="2018-09-26-1.PNG"><span class="name">2018-09-26-1.PNG</span><span class="size">1406471</span><span class="date">2018-9-16 18:37:23</span></a></li>
<li><a href="/public/img/events/poster/2018-09-26-2.PNG" class="" title="2018-09-26-2.PNG"><span class="name">2018-09-26-2.PNG</span><span class="size">530859</span><span class="date">2018-9-16 18:37:44</span></a></li>
<li><a href="/public/img/events/poster/2018-09-26-3.PNG" class="" title="2018-09-26-3.PNG"><span class="name">2018-09-26-3.PNG</span><span class="size">551409</span><span class="date">2018-9-16 18:38:24</span></a></li>
<li><a href="/public/img/events/poster/test" class="" title="test"><span class="name">test</span><span class="size">0</span><span class="date">2018-10-4 20:16:58</span></a></li></ul>
</div>
</body>
<html>`;
var bodyRegex = /<s*body.*>([sS]*)<s*/body>/g;
var bodyString = bodyRegex.exec(myString)[0];
var myRegexp = /<li[^>]*>[^<]*<a[^>]*href="([^"]+)"/g;
match = myRegexp.exec(bodyString);
while (match != null) {
// matched text: match[0]
// match start: match.index
// capturing group n: match[n]
console.log(match[1])
match = myRegexp.exec(bodyString);
}

它必须是正则表达式吗？这个解决方案似乎有效。

const links = document.querySelectorAll('#files a');
links.forEach(link => {
console.log(link.getAttribute('href'));
})

更新 1

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