如何使用python bs4提取javascript变量

Question

<script type="text/javascript">var csrfMagicToken = "sid:bf8be784734837a64a47fcc30b9df99,162591180";var csrfMagicName = "__csrf_magic";</script>

The above script tag is from a webpage.

script = soup.find_all('script')[5]

By using the above line of code I was able to extract the script tag which I want but I need to extract the value of variables in a python script,I am using BeautifulSoup in my python script to extract the data.

Answer 1

You could use

(?:var|let)\s+(\w+)\s*=\s*"([^"]+)"

See a demo on regex101.com .

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Note: However, there are a couple of drawbacks in general to using regular expressions on code. Eg with the above, sth. like let x = -10; would not be matched but would be totally valid JavaScript code. Also, single quotes are not supported (yet) - it totally depends on your actual input.

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That being said, you could go for:

(?:var|let)\s+
(?P<key>\w+)\s*=\s*
(['"])?(?(2)(?P<value1>.+?)\2|(?P<value2>[^;]+))

See another demo on regex101.com .

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This still leaves you helpless against escaped quotes like let x = "some \\" string"; or against variable declarations in comments. In general, favour a parser solution.