问题描述
如何检测字符串中是否包含html(可以是html4，html5，也可以是文本内的html部分)?我不需要HTML版本，但是如果字符串只是文本或包含html，则不需要.文本通常是多行，也有空行
How to detect either the string contains an html (can be html4, html5, just partials of html within text)? I do not need a version of HTML, but rather if the string is just a text or it contains an html. Text is typically multiline with also empty lines
示例输入:
html:
<head><title>I'm title</title></head>
Hello, <b>world</b>
非html:
<ht fldf d><
<html><head> head <body></body> html
推荐答案
您可以使用HTML解析器，例如 BeautifulSoup .请注意，它确实会尽最大努力来解析HTML，甚至是损坏的HTML，根据基础解析器:
You can use an HTML parser, like BeautifulSoup. Note that it really tries it best to parse an HTML, even broken HTML, it can be very and not very lenient depending on the underlying parser:
>>> from bs4 import BeautifulSoup
>>> html = """<html>
... <head><title>I'm title</title></head>
... </html>"""
>>> non_html = "This is not an html"
>>> bool(BeautifulSoup(html, "html.parser").find())
True
>>> bool(BeautifulSoup(non_html, "html.parser").find())
False
这基本上是尝试在字符串内查找任何html元素.如果找到-结果为True.
This basically tries to find any html element inside the string. If found - the result is True.
另一个带有HTML片段的示例:
Another example with an HTML fragment:
>>> html = "Hello, <b>world</b>"
>>> bool(BeautifulSoup(html, "html.parser").find())
True
或者，您可以使用 lxml.html :
Alternatively, you can use lxml.html:
>>> import lxml.html
>>> html = 'Hello, <b>world</b>'
>>> non_html = "<ht fldf d><"
>>> lxml.html.fromstring(html).find('.//*') is not None
True
>>> lxml.html.fromstring(non_html).find('.//*') is not None
False
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