python正则表达式拆分段落 [英] python regular expression to split paragraphs
问题描述
一个人如何编写一个正则表达式以在python中用于拆分段落?
How would one write a regular expression to use in python to split paragraphs?
一个段落由2个换行符(\ n)定义.但是一个人可以有任意数量的空格/制表符以及换行符,并且仍应将其视为一个段落.
A paragraph is defined by 2 linebreaks (\n). But one can have any amount of spaces/tabs together with the line breaks, and it still should be considered as a paragraph.
我正在使用python,因此解决方案可以使用python的正则表达式语法这是扩展的. (可以利用(?P...)
的东西)
I am using python so the solution can use python's regular expression syntax which is extended. (can make use of (?P...)
stuff)
the_str = 'paragraph1\n\nparagraph2'
# splitting should yield ['paragraph1', 'paragraph2']
the_str = 'p1\n\t\np2\t\n\tstill p2\t \n \n\tp3'
# should yield ['p1', 'p2\t\n\tstill p2', 'p3']
the_str = 'p1\n\n\n\tp2'
# should yield ['p1', '\n\tp2']
我能带给我的最好的是:r'[ \t\r\f\v]*\n[ \t\r\f\v]*\n[ \t\r\f\v]*'
,即
The best I could come with is: r'[ \t\r\f\v]*\n[ \t\r\f\v]*\n[ \t\r\f\v]*'
, i.e.
import re
paragraphs = re.split(r'[ \t\r\f\v]*\n[ \t\r\f\v]*\n[ \t\r\f\v]*', the_str)
但这很丑.有什么更好的吗?
but that is ugly. Anything better?
编辑:
r'\s*?\n\s*?\n\s*?'
->这将使示例2和3失败,因为\s
包含\n
,因此它将允许使用超过2个\n
的段落分隔符.
r'\s*?\n\s*?\n\s*?'
-> That would make example 2 and 3 fail, since \s
includes \n
, so it would allow paragraph breaks with more than 2 \n
s.
推荐答案
不幸的是,没有好的方法可以写空格,但不能换行".
Unfortunately there's no nice way to write "space but not a newline".
我认为您能做的最好的事情就是使用x
修饰符添加一些空间,并尝试排除一些丑陋之处,但这是有问题的:(?x) (?: [ \t\r\f\v]*? \n ){2} [ \t\r\f\v]*?
I think the best you can do is add some space with the x
modifier and try to factor out the ugliness a bit, but that's questionable: (?x) (?: [ \t\r\f\v]*? \n ){2} [ \t\r\f\v]*?
您还可以尝试仅为该字符类创建一个子规则,并将其插入3次.
You could also try creating a subrule just for the character class and interpolating it three times.
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