如何在正则表达式中使用括号获得多个数字

Question

I was trying to extract values from a html code using urllib and regular expressions in python3 and when I tried to run this code, it only gave me one of the digits of the number instead of both values even though I added a "+" sign meaning one or more times. What's wrong here?

import re
import urllib.error,urllib.parse,urllib.request
from bs4 import BeautifulSoup
finalnums=[]
sumn=0
urlfile = urllib.request.urlopen("http://py4e-data.dr-chuck.net/comments_42.html")

html=urlfile.read()
soup = BeautifulSoup( html,"html.parser" )
spantags = soup("span")
for span in spantags:
    span=span.decode()  
    numlist=re.findall(".+([0-9].*)<",span)
    print(numlist)
    finalnums.extend(numlist)
for anum in finalnums:
    sumn=sumn+int(anum)
print("Sum = ",sumn)

This is an example of the string I'm trying to extract the number from:

 <span class="comments">54</span>

Answer 1

Use numlist=re.findall("\d+",span) to search for all contiguous groups of digit characters.

\d is a character class that's equivalent to [0-9] , so it would also work if you did numlist=re.findall("[0-9]+",span)

Answer 2

Since there is only one number in each <span> tag:

sumn = 0
for span in spantags:
    sumn += int(re.search(r'\d+', span.decode()).group(0))