从网站上用美丽的汤刮擦文本字符串

Question

I would like to scrape a webpage and just return the GTM (Google Tag Manager) container ID (In the example below it would be GTM-5LS3NZ). The code shouldn't look for the exact container ID but rather the pattern as I will use it on muultiple sites.

So far I can search the head and print the entire piece of text containing GTM, but I don't know how to format the find and the regex together to just return GTM-5LS3NZ (In this example).

import urllib3
import re
from bs4 import BeautifulSoup

http = urllib3.PoolManager()

response = http.request('GET', "https://www.observepoint.com/")
soup = BeautifulSoup(response.data,"html.parser")

GTM = soup.head.findAll(text=re.compile(r'GTM'))
print(GTM)

Note: The GTM ID can have 6 or 7 alphanumeric characters so I would expect the regex for the container ID to be something like ^GTM-[A-Z0-9] - I don't know how to specify 6 or 7 characters.

Clarification on what I am after. If you run the code above you get the following.

["(function (w, d, s, l, i) {\n      w[l] = w[l] || [];\n      w[l].push({\n        'gtm.start': new Date().getTime(),\n        event: 'gtm.js'\n      });\n      var f = d.getElementsByTagName(s)[0],\n        j = d.createElement(s),\n        dl = l != 'dataLayer' ? '&l=' + l : '';\n      j.async = true;\n      j.src =\n        'https://www.googletagmanager.com/gtm.js?id=' + i + dl;\n      f.parentNode.insertBefore(j, f);\n    })(window, document, 'script', 'dataLayer', 'GTM-5LS3NZ');"]

Where all I want is GTM-5LS3NZ.

Answer 1

I have worked it out now, thanks to the help in the comments. This is what I was after:

import re
from bs4 import BeautifulSoup

http = urllib3.PoolManager()

response = http.request('GET', "https://www.observepoint.com/")
soup = BeautifulSoup(response.data,"html.parser")

GTM = soup.head.findAll(text=re.compile(r'GTM'))
print(re.search("GTM-[A-Z0-9]{6,7}",str(GTM))[0])

Answer 2

I did something similar a few days ago, and a quick rewrite gives me:

import urllib3
import re
from bs4 import BeautifulSoup

http = urllib3.PoolManager()

response = http.request('GET', "https://www.observepoint.com/")
soup = BeautifulSoup(response.data,"html.parser")

pattern  =re.compile(r'GTM-([a-zA-Z0-9]{6,7})')
found = soup.head.find(text=pattern)
if found:
    match = pattern.search(found)
    if match:
        print(match.group(1))

This gives me GTM-5LS3NZ as output.

Answer 3

You could also extract from appropriate comment

import requests
from bs4 import BeautifulSoup, Comment

r = requests.get('https://www.observepoint.com/')
soup = BeautifulSoup(r.content, 'lxml')
for comment in soup.findAll(text=lambda text:isinstance(text, Comment)):
    if 'iframe' in comment:
        soup = BeautifulSoup(comment, 'lxml')
        id = soup.select_one('iframe')['src'].split('=')[1]
        print(id)
        break