从包含关键字列表的re.compile中匹配单个关键字

Question

我有关键字

cat="AUTHORISATION,FORTHCOMING BOARD MEETINGS,PREVIOUS BOARD MEETINGS,BOARD MEETINGS,BOARD MEETING,MINUTES,BOARD PAPERS,AGENDA,COMMUNITY PROFILES,FORTHCOMING GOVERNOR MEETINGS,PREVIOUS GOVERNOR MEETINGS,GOVERNOR MEETINGS,GOVERNOR MEETING,GOVERNOR,COUNCIL OF GOVERNORS,GOVERNING BODY MEETINGS,COMPARISON,APC SUMMARY OF DECISIONS"

我有一些这样的预处理

cat_list=cat.split(',')
cat_list=filter(None, cat_list)
cat_list=[s.strip() for s in cat_list]
cat_list=[re.sub('\r\n' , ' ', s) for s in cat_list]
cat_list=[re.sub(r'([^\s])\s([^\s])', r'\1+(.)+\2',x) for x in cat_list]
cat_list=[re.sub(r'([a-z][a-z]+)', r'(\1)',a,flags=re.I) for a in cat_list]
regexes_cat=[re.compile((r'(?:%s)' % '|'.join(cat_list)),re.IGNORECASE),]

它为我提供列表中的re.compile表达式以执行re.search，因此处理后的最终正则表达式如下所示

(?:(AUTHORISATION)|(FORTHCOMING)+(.)+(BOARD)+(.)+(MEETINGS)|(PREVIOUS)+(.)+(BOARD)+(.)+(MEETINGS)|(BOARD)+(.)+(MEETINGS)|(BOARD)+(.)+(MEETING)|(MINUTES)|(BOARD)+(.)+(PAPERS)|(AGENDA)|(COMMUNITY)+(.)+(PROFILES)|(FORTHCOMING)+(.)+(GOVERNOR)+(.)+(MEETINGS)|(PREVIOUS)+(.)+(GOVERNOR)+(.)+(MEETINGS)|(GOVERNOR)+(.)+(MEETINGS)|(GOVERNOR)+(.)+(MEETING)|(GOVERNOR)|(COUNCIL)+(.)+(OF)+(.)+(GOVERNORS)|(GOVERNING)+(.)+(BODY)+(.)+(MEETINGS)|(COMPARISON)|(APC)+(.)+(SUMMARY)+(.)+(OF)+(.)+(DECISIONS))

但是如果我打印组(0)，我会得到这样的结果。

GOVERNORS-MEETINGS.ASP?P=GOVERNORS%27.COUNCIL.MEETINGS

因此，我搜索并发现，我必须使用使其非贪婪，但我无法获得所需的输出，这应该是

GOVERNORS-MEETINGS

我正在针对网页上的URL和文本执行re.search

http://www.qehkl.nhs.uk/governors-meetings.asp?p=governors%27.council.meetings&s=main&ss=becoming.a.foundation.trust

Answer 1

我建议的解决办法是基于以下假设：

• regex匹配应该发生在路径的最后一部分(即文件部分，在任何最终的查询字符串之前)。
• 查询字符串是可选的。

因此，解决方案是首先使用urlparse解析URL，以便只获得运行正则表达式的字符串，而忽略了查找器。与(.)+不同，只需使用懒散的(.*?)来匹配尽可能少的0+字符：

import re
from urlparse import urlparse

cat="AUTHORISATION,FORTHCOMING BOARD MEETINGS,PREVIOUS BOARD MEETINGS,BOARD MEETINGS,BOARD MEETING,MINUTES,BOARD PAPERS,AGENDA,COMMUNITY PROFILES,FORTHCOMING GOVERNOR MEETINGS,PREVIOUS GOVERNOR MEETINGS,GOVERNOR MEETINGS,GOVERNOR MEETING,GOVERNOR,COUNCIL OF GOVERNORS,GOVERNING BODY MEETINGS,COMPARISON,APC SUMMARY OF DECISIONS"
cat_list=cat.split(',')
cat_list=filter(None, cat_list)
cat_list=[s.strip() for s in cat_list]
cat_list=[re.sub('\r\n' , ' ', s) for s in cat_list]
cat_list=[re.sub(r'([^\s])\s([^\s])', r'\1(.*?)\2',x) for x in cat_list] # Allow anything in between the keywords, but as few as possible
cat_list=[re.sub(r'([a-z][a-z]+)', r'(\1)', a, flags=re.I) for a in cat_list]
regex_cat=re.compile(r"(?:{})".format('|'.join(cat_list)),re.IGNORECASE)
#print(regex_cat.pattern)
urls = "GOVERNORS/GOVERNORS-MEETINGS.ASP?P=GOVERNORS%27.COUNCIL.MEETINGS "
o = urlparse(urls)                       # Parse the URL
last_subpart = o.path.split('/').pop()   # Get the last subpart
m = regex_cat.search(last_subpart)       # Run the regex search
if m:                                    # If there is a match...
    print(m.group())                     # Print or do anything with the value

见Python演示

Answer 2

试试下面的代码-

cat_list=cat.split(',')
cat_list=filter(None, cat_list)
cat_list=[s.strip() for s in cat_list]
cat_list=[re.sub('\r\n' , ' ', s) for s in cat_list]

#Till now all same, following statements have changes
cat_list=[re.sub(r'([^\s])\s([^\s])', r'\1+.+?\2',x) for x in cat_list]
cat_list=['(%s)'%re.sub(r'([a-z]+)', r'(\1)',a,flags=re.I) for a in cat_list]
regexes_cat=[re.compile((r'(?:%s)' % '|'.join(cat_list)),re.IGNORECASE),]

这是工作的演示。