如何使用 Python 中的正则表达式从同一个字符串中提取多个值？

Question

I am currently trying to scrape some data from a webpage. The data I need is within the <meta> tag of the html source. Scraping the data and saving it to a String with BeautifulSoup is no problem.

The String contains 2 numbers I want to extract. Each of those numbers (review scores from 1-100) should be assigned to a distinct variable for further processing.

test_str = "<meta content=\"Overall Rating: 79/100 ... Some Info ... Score: 86/100 \"/>"

The first value is 79/100 and the second is 86/100 , but I only need 79 and 86 . So far I have created a regex search to find those values and then .replace("/100") to clean things up.

But with my code, I only get the value for the first regex search match, which is 79 . I tried getting the second value with m.group(1) but it doesn't work.

What am I missing ?

test_str = "<meta content=\"Overall Rating: 79/100 ... Some Info ... Score: 86/100 \"/>"

m = re.search("../100", test_str)
if m:
    found = m.group(0).replace("/100","")
    print found

    # output -> 79

Thanks for your help.

Best regards!

Answer 1

test_str = "<meta content=\"Overall Rating: 79/100 ... Some Info ... Score: 86/100 \"/>"    
m =  re.findall('(\d+(?=\/100))', test_str)
# m = ['79', '86']

I changed .. with /d+ so you can search for either 1 digit or 2

I also use a positive lookahead (?=...) , so the .replace becomes unnecessary

Example at Regex101

Answer 2

I dont know why most people are not suggesting back references to a named group.

You can do something like below, syntax might not be perfect.

test_str = "<meta content=\"Overall Rating: 79/100 ... Some Info ... Score: 86/100 \"/>"

pattern = "^<meta content=\"Overall Rating: (?P<rating>.*?) ... Some Info ... (?P<score>.*?)$"

match = re.match(pattern, test_str)

match.group('rating')
match.group('score')