使用 BeautifulSoup 在网页中查找特定链接
from BeautifulSoup import BeautifulSoup
import urllib2
import re
user = raw_input('begin here!: ')
base = ("http://1337x.org/search/")
print (base + user)
add_on = "/0/"
total_link = (base + user + add_on)
html_data = urllib2.urlopen(total_link, 'r').read()
soup = BeautifulSoup(html_data)
announce = soup.find('a', attrs={'href': re.compile("^/announcelist")})
print announce
我正在尝试检索 torrent 链接，最好是第一个非赞助链接。从页面然后让它打印链接。我对这个编码相当陌生，所以你能提供的尽可能多的细节将是完美的！非常感谢您的帮助！
from BeautifulSoup import BeautifulSoup
import urllib2
import re
user = raw_input('begin here!: ')
base = ("http://1337x.org/search/")
print (base + user)
add_on = "/0/"
total_link = (base + user + add_on)
html_data = urllib2.urlopen(total_link, 'r').read()
soup = BeautifulSoup(html_data)
announce = soup.find('a', attrs={'href': re.compile("^/announcelist")})
print announce
i am attempting to retrieve a torrent link preferably the first non sponsored link. from a page and then have it print the link. i am rather new at this coding so as much detail as you can give would be perfect! thank you so much for the help!
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问题出在你的正则表达式中。您尝试使用
^字符来否定正则表达式，但它在您的情况下不起作用。^仅对一组字符（[]内的一组字符）求反；即使在这种情况下，它也只会在它是第一个字符时才会否定。例如，[^aeiou]表示“任何字符除了a、e、i、<代码>o和<代码>u”。当您在字符集之外使用
^时，它会匹配行的开头。例如，^aeiou匹配以aeiou字符串开头的行。那么，如何否定正则表达式呢？嗯，我认为最好的方法是使用否定前瞻，这是一个以
(?!开头并以)结尾的正则表达式。对于您的情况，这非常简单：(?!/announcelist)因此，将
re.compile("^/announcelist")替换为re.compile ("(?!/announcelist)")它应该可以工作 - 至少在这里工作:)The problem is in your regular expression. You are trying to use the
^character to negate the regex, but it does not work in your situation. The^only negates a set of characters (a set of chars inside[]); even in this case it only negates if it is the first char. For example,[^aeiou]means "any character excepta,e,i,oandu".When you use
^outside a character set, then it matches the beginning of a line. For example,^aeioumatches a line which starts with theaeioustring.So, how would you negate a regex? Well, the best way I see is to use a negative lookahead, which is a regex that starts with
(?!and ends with). For your case, it is pretty easy:(?!/announcelist)So, replace the
re.compile("^/announcelist")byre.compile("(?!/announcelist)")and it should work - at least worked here :)