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我有以下python代码

from io import BytesIO
import pdfplumber, requests
test_case = {
    'https://www1.hkexnews.hk/listedco/listconews/sehk/2020/0514/2020051400555.pdf': 59,
    'https://www1.hkexnews.hk/listedco/listconews/gem/2020/0529/2020052902118.pdf': 55,
    'https://www1.hkexnews.hk/listedco/listconews/sehk/2020/0618/2020061800366.pdf': 47,
    'https://www1.hkexnews.hk/listedco/listconews/gem/2020/0630/2020063002674.pdf': 30,
}

for url, page in test_case.items():
    rq = requests.get(url)
    pdf = pdfplumber.load(BytesIO(rq.content))
    txt = pdf.pages[page].extract_text()
    txt = re.sub("([^\x00-\x7F])+", "", txt)  # no chinese
    pattern = r'.*\n.*?(?P<auditor>[A-Z].+?\n?)(?:LLP\s*)?\s*((PRC.*?|Chinese.*?)?[Cc]ertified [Pp]ublic|[Cc]hartered) [Aa]ccountants'
    try:
        auditor = re.search(pattern, txt, flags=re.MULTILINE).group('auditor').strip()
        print(repr(auditor))
    except AttributeError:
        print(txt)
        print('============')
        print(url)

它产生以下结果

'ShineWing'
'ShineWing'
'Hong Kong Standards on Auditing (HKSAs) issued by the Hong Kong Institute of'
'Hong Kong Financial Reporting Standards issued by the Hong Kong Institute of'

期望的结果是：

'ShineWing'
'ShineWing'
'Ernst & Young'
'Elite Partners CPA Limited'

我试过：

pattern = r'.*\n.*?(?P<auditor>[A-Z].+?\n?)$(?!Institute)(?:LLP\s*)?\s*((PRC.*?|Chinese.*?)?[Cc]ertified [Pp]ublic|[Cc]hartered) [Aa]ccountants' 此模式捕获最后两种情况，但不捕获前两种情况。

pattern = r'.*\n.*?(?P<auditor>^(?!Hong|Kong)[A-Z].+?\n?)(?:LLP\s*)?\s*((PRC.*?|Chinese.*?)?[Cc]ertified [Pp]ublic|[Cc]hartered) [Aa]ccountants' 这会产生预期的结果，但^(?!Hong|Kong)有潜在的风险，因为它可能会在未来忽略其他预期的结果，因此它不是一个好的候选者。

相反，$(?!Institute)它更通用、更合适，但我不知道为什么在前两种情况下无法匹配。如果有一种方法可以忽略包含issued by the Hong Kong Institute of

任何建议将不胜感激。谢谢你。

4

1 回答 1

0 
pattern = r'\n.*?(?P<auditor>(?!.*Institute)[A-Z].+?)(?:LLP\s*)?\s*((PRC.*?|Chinese.*?)?[Cc]ertified [Pp]ublic|[Cc]hartered) [Aa]ccountants'

这行得通。

于 2020-08-09T10:55:04.730 回答