python - How to get the content I want by including the <dl></dl> tag

Question

1. When I add the <dl> tag, I get empty content. How should I write the matching rules? I can get the desired content without adding the <dl> tag.
2. Question code

pattern = re.compile(r'<dl>.*?<dd><a href="(.*?)">(.*?)</a></dd>.*?</dl>')

3. You can get the content you want without adding the <dl> tag

4. Attach the web page source code

<dl>
                <dt>《明末工程师》正文</dt>
                <dd><a href="/book/1440/xx">第一章 穿越后的窘境</a></dd>
</dl>

Answer 1

# 你可能需要加个模式
# re.S    使 . 匹配包括换行在内的所有字符
pattern = re.compile(r'<dl>.*?<dd><a href="(.*?)">(.*?)</a></dd>.*?</dl>', re.S)
print re.findall(pattern, a)

Answer 2

// /需要转义下
<dl>.*?<dd><a href="(.*?)">(.*?)<\/a><\/dd>.*?<\/dl>