我有以下 python 代碼from io import BytesIOimport pdfplumber, requeststest_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)它產生以下結果'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'期望的結果是：'ShineWing''ShineWing''Ernst & Young''Elite Partners CPA Limited'我試過：pattern = r'.*\n.*?(?P<auditor>[A-Z].+?\n?)$(?!Institute)(?:LLP\s*)?\s*((PRC.*?|Chinese.*?)?[Cc]ertified [Pp]ublic|[Cc]hartered) [Aa]ccountants' 此模式捕獲后兩種情況，但不捕獲前 2 種情況。pattern = r'.*\n.*?(?P<auditor>^(?!Hong|Kong)[A-Z].+?\n?)(?:LLP\s*)?\s*((PRC.*?|Chinese.*?)?[Cc]ertified [Pp]ublic|[Cc]hartered) [Aa]ccountants' 這會產生所需的結果，但^(?!Hong|Kong)存在潛在風險，因為它可能會在未來忽略其他所需的結果，因此它不是一個好的候選者。相反，$(?!Institute)更通用和合適，但我不知道為什么它在前兩種情況下無法匹配。如果有一種方法可以忽略包含的匹配項，那就太好了issued by the Hong Kong Institute of任何建議將不勝感激。謝謝。