我想要一个正则表达式来从 HTML 页面中提取标题。目前我有这个：
title = re.search('<title>.*</title>', html, re.IGNORECASE).group()
if title:
title = title.replace('<title>', '').replace('</title>', '')
是否有正则表达式可以仅提取
的内容，因此我不必删除标签？</p>
<blockquote>
<p>原文由 <a href="https://link.segmentfault.com/?enc=aYmPRcBHbcwySvOv7oYEDA%3D%3D.mBjMyc7vAqterOX94iGamKL93RvwUMf52bD%2BkQywPmWbB80vL5vBGwQ4AdX2Pv8TFuepbdbP2Rpx4iL4Li6ZVLdR495YeG5%2Bg7qggATeHLc%3D" rel="nofollow" target="_blank">hoju</a> 发布，翻译遵循 CC BY-SA 4.0 许可协议</p>
</blockquote>
</article><div class="d-flex flex-wrap align-items-center mb-4"><div class="m-n1 d-flex flex-wrap align-items-center"><a class="m-1" href="/site/stackoverflow" target="_blank"><img src="https://avatar-static.segmentfault.com/315/258/3152588376-62ff5cc2ea2d8_huge128" alt="Stack Overflow 翻译" width="24" height="24" style="border-radius:0.1875rem;vertical-align:top"/></a><a href="/t/python" class="m-1 badge-tag "><img src="https://avatar-static.segmentfault.com/252/177/2521771040-54cb53b372821_small" alt="" width="16" height="16" class="me-1"/>python</a><a href="/t/html" class="m-1 badge-tag ">html</a><a href="/t/%E6%AD%A3%E5%88%99%E8%A1%A8%E8%BE%BE%E5%BC%8F" class="m-1 badge-tag ">正则表达式</a><a href="/t/html-content-extraction" class="m-1 badge-tag ">html-content-extraction</a></div></div><div class="text-secondary font-size-14 d-flex flex-column"><div class="functional-area-bottom d-flex flex-wrap "><button type="button" class="me-2 mb-3 btn btn-primary-100"><i class="far fa-thumbs-up me-1"></i>有用</button><button type="button" class="me-2 mb-3 false btn btn-primary-100"><i class="far fa-flip-horizontal fa-thumbs-down"></i></button><button type="button" class="me-2 mb-3 btn btn-light"><span class="me-1">关注</span><span class="mainLikeNum hidden">0</span></button><button type="button" class="me-2 mb-3 false btn btn-light"><span class="mx-1">收藏</span><span class="mainLikeNum hidden">0</span></button><div class="me-2 mb-3 dropdown"><button type="button" id="react-aria-4" aria-expanded="false" aria-label="分享" class="dropdown-no-angle dropdown-toggle btn btn-light"><i class="far fa-share-nodes"></i></button></div><canvas hidden="" class="qrcode"></canvas></div><div class="d-flex align-items-center justify-content-between right-wrap w-100"><div><button type="button" class="link-secondary question-reply-btn btn-reset btn btn-link btn-sm">回复</button><span class="split-dot"></span><div class="text-secondary font-size-14 d-inline-flex justify-content-between" id="viewsWord" data-viewsword="9">阅读 <!-- -->291<!-- --> </div></div><div class="operation text-end"></div></div></div><div class="lazyload-wrapper "><div class="lazyload-placeholder"></div></div></div></div></div><div id="OA_holder_3" class="OA_holder" style="display:none"></div><div class="mt-4 answer-area card"><div class="d-flex align-items-center justify-content-between bg-transparent card-header"><strong>2<!-- --> <!-- -->个回答</strong><div aria-label="Basic" role="group" class="btn-group"><a role="button" tabindex="0" href="/q/1010000042527904?sort=votes" class="btn btn-secondary btn-sm">得票</a><a role="button" tabindex="0" href="/q/1010000042527904?sort=newest" class="btn btn-outline-secondary btn-sm">最新</a></div></div><div class="list-group list-group-flush"><div class="p-0 stack-overflow-site list-group-item"><div class="p-3 answer-accept"><div class="commentUnit"><div class="information mb-3 font-size-14"><div class="d-flex align-items-center"><div class="d-flex"><div class="d-flex align-items-center "><a href="https://segmentfault.com/a/1190000042203704" class="d-flex align-items-center me-1"><div style="width:32px;height:32px;background:#6F42C1" class="rounded-circle d-flex align-items-center justify-content-center me-2"><i class="far fa-book-open text-white"></i></div><div class="d-flex flex-column"><div><strong class="align-self-center" itemProp="name">社区维基</strong><i class="far fa-globe text-warning ms-1"></i></div><span style="color:#BF7158;font-weight:bold">1</span></div></a></div><div class="vertical-divider"></div><div><a href="/q/1010000042527904/a-1020000042527908/revision" class="link-secondary"><time itemProp="dateCreated" dateTime="2022-09-21T09:10:52.000Z">发布于 <br/> <!-- -->2022-09-21 </time></a></div></div></div><span class="mt-3 me-2 badge rounded-pill bg-success">✓ 已被采纳</span></div><article id="1020000042527908" class="article fmt article-content"><p>Use <code>(</code> <code>)</code> in regexp and <a href="https://link.segmentfault.com/?enc=PuLg3Kk5P2WLboy8v2D7iw%3D%3D.L10pF8KAh2cOHVHOdcmVmL%2BH%2BS0HdFS086B%2BLZNoU%2FKuGb3YfTphZgw%2BUL%2Fej96G49DjJGrvIqHf220d5j%2FuxQ%3D%3D" rel="nofollow" target="_blank"><code>group(1)</code></a> in python to retrieve the captured string ( <a href="https://link.segmentfault.com/?enc=barUlTIGUMDH6I18cVq4KQ%3D%3D.DtWIpWsXBiLpFqmRzqN9HE7RXi9sh5fGovEgZhgwGFaXMBq0DgpbX%2Fx5Dhn8rJMbu0nTgPD87o8L%2FPcEJNWlYA%3D%3D" rel="nofollow" target="_blank"><code>re.search</code></a> will return <code>None</code> if它没有找到结果，所以 <em>不要直接使用 <code>group()</code></em> ）：</p>
<pre><code> title_search = re.search('<title>(.*)</title>', html, re.IGNORECASE)
if title_search:
title = title_search.group(1)
</code></pre>
<blockquote>
<p>原文由 <a href="https://link.segmentfault.com/?enc=x7bp7xvpBO2qhsIVXv0YWg%3D%3D.B6pdPuJPFi9roOeSMBTwlzloUFnv5NWu9yCpPRX3pUpLKqVrO%2BI8dKHQRAo0gqricwxwHXvZKEU7L9NbQDDXtkyPQi0pMDNhx2%2F7hThBcwFnj%2FD5n7Eo1stf%2FRU7MnI0" rel="nofollow" target="_blank">Krzysztof Krasoń</a> 发布，翻译遵循 CC BY-SA 4.0 许可协议</p>
</blockquote>
</article><div class="text-secondary font-size-14"><div class="d-flex"><div class="functional-area-bottom d-flex flex-wrap "><button type="button" class="me-2 mb-3 btn btn-primary-100"><i class="far fa-thumbs-up me-1"></i>有用</button><button type="button" class="me-2 mb-3 false btn btn-primary-100"><i class="far fa-flip-horizontal fa-thumbs-down"></i></button></div></div><div class="d-flex justify-content-between align-items-center flex-fill"><div class="sflex-center"><button type="button" class="btn-reset link-secondary question-reply-btn btn btn-link">回复</button></div><div class="operation text-end"></div></div></div></div><div class="lazyload-wrapper "><div class="lazyload-placeholder"></div></div></div></div><div class="p-0 stack-overflow-site list-group-item"><div class="p-3 "><div class="commentUnit"><div class="information mb-3 font-size-14"><div class="d-flex align-items-center"><div class="d-flex"><div class="d-flex align-items-center "><a href="https://segmentfault.com/a/1190000042203704" class="d-flex align-items-center me-1"><div style="width:32px;height:32px;background:#6F42C1" class="rounded-circle d-flex align-items-center justify-content-center me-2"><i class="far fa-book-open text-white"></i></div><div class="d-flex flex-column"><div><strong class="align-self-center" itemProp="name">社区维基</strong><i class="far fa-globe text-warning ms-1"></i></div><span style="color:#BF7158;font-weight:bold">1</span></div></a></div><div class="vertical-divider"></div><div><a href="/q/1010000042527904/a-1020000042527906/revision" class="link-secondary"><time itemProp="dateCreated" dateTime="2022-09-21T09:10:52.000Z">发布于 <br/> <!-- -->2022-09-21 </time></a></div></div></div></div><article id="1020000042527906" class="article fmt article-content"><p>请注意，从 <code>Python 3.8</code> 开始，并引入 <a href="https://link.segmentfault.com/?enc=XkSNl5jgPqzyuFas%2B23WYQ%3D%3D.MoUQCzD%2BjN3PLST8n0wyX8nep5K0kjfjuwIUK%2FYgVjtMEMWiCqyiUYfx5mQfHsb9" rel="nofollow" target="_blank">赋值表达式（PEP 572）</a> （ <code>:=</code> 运算符），可以通过直接在 <a href="https://link.segmentfault.com/?enc=CtU94WisyhYWPijI0EIW4A%3D%3D.7IASkVms2Mrvj2Qi2wJbm8anA3fBhoxTdD4uTD%2FheBeiG6v382YkwYytZ2CVlpox" rel="nofollow" target="_blank">Krzysztof Krasoń 的解决方案</a> 中捕获匹配结果来改进一点if 条件作为变量并在条件的主体中重新使用它：</p>
<pre><code> # pattern = '<title>(.*)</title>'
# text = '<title>hello</title>'
if match := re.search(pattern, text, re.IGNORECASE):
title = match.group(1)
# hello
</code></pre>
<blockquote>
<p>原文由 <a href="https://link.segmentfault.com/?enc=Libsn6DlYuJrDR2flz95iQ%3D%3D.mTqqDngIorcxxcs63QvPSLpzLIJ7Hv0ALipwl7D6amaeJE6tP5On2wFos4TgwsiW3u%2FLpYohNF9HDA0xNUoCSRai35aExI%2FFafvjzLQQdEPCwy1GNKywuWGHpFqfrMFm" rel="nofollow" target="_blank">Xavier Guihot</a> 发布，翻译遵循 CC BY-SA 4.0 许可协议</p>
</blockquote>
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