我是用美丽的汤拔出具体div标签,似乎我无法使用简单的字符串匹配。
I am using Beautiful Soup to pull out specific div tags, and it seems I can't use simple string matching.
该页面有一些标签的形式
The page has some tags in the form of
<div class="comment form new"...>我想忽略,也有些标签的形式
which I want to ignore, and also some tags in the form of
<div class="comment comment-xxxx...">其中x重新present任意长度的整数,椭圆重新presents用空格分隔的其他值(即我不关心)的任意数量。我想不通的正确的正则表达式前pression,尤其是因为我从来没有使用Python的重类。
where the x's represent an integer of arbitrary length, and the ellipses represents an arbitrary number of other values separated by white spaces (that I'm not concerned about). I can't figure out the correct regex expression, especially since I've never used python's re class.
使用
soup.find_all(class_="comment")查找以单词注释的所有标签。我已经尝试使用
finds all tags starting with the word comment. I have tried using
soup.find_all(class_=repile(r'(comment)( )(comment)')) soup.find_all(class_=repile(r'comment comment.*'))和许多其他的变化,但我想我缺少明显的东西在这里如何的正则表达式前pressions或匹配()的工作。谁能帮我?
and lots of other variations, but I think I'm missing something obvious here about how regex expressions or match() work. Can anyone help me out?
推荐答案我想我知道了:
>>> [div['class'] for div in soup.find_all('div')] [['comment', 'form', 'new'], ['comment', 'comment-xxxx...']]注意,不像BS3相当于它不是这样的:
Notice that, unlike the equivalent in BS3, it's not this:
['comment form new', 'comment comment-xxxx...']这就是为什么你的正则表达式不匹配。
And that's why your regexps won't match.
但你可以匹配,例如,这样的:
But you can match, e.g., this:
>>> soup.find_all('div', class_=repile('comment-')) [<div class="comment comment-xxxx..."></div>]需要注意的是BS确实 re.search 相当于,没有 re.match ,所以你不需要'评论 - *。。当然,如果你想匹配评论-12345而不是评论-OF-另一个实物你 ð希望,例如,'comment- \\ D + 。
Note that BS does the equivalent of re.search, not re.match, so you don't need 'comment-.*'. Of course if you want to match 'comment-12345' but not 'comment-of-another-kind you'd want, e.g., 'comment-\d+'.
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