Python的正則表達式爲多個分隔符，包括使用正則表達式雙引號

Question

代碼在Python可以像這樣

輸入執行的東西：

> https://test.com, 2017-08-14, "This is the title with , and "anything" in it", "This is the paragraph also with , and "anything" in it" 

理想的輸出：

['https://test.com', '2017-08-14', 'This is the title with , and "anything" in it', 'This is the paragraph also with , and "anything" in it'] 

Answer 1

有您可以使用多種方法拆分。

香草內置分割方法接受分隔符作爲一個參數，並會做什麼是對錫寫的，正是在已經指定的任何分隔符拆分字符串，返回它作爲一個列表。

在你的情況，你想要的分隔符爲「」但只有不在引號內的逗號。在一般情況下，這樣的事情你可以做：

foo = 'https://test.com, 2017-08-14, "This is the title with , and "anything" in it", "This is the paragraph also with , and "anything" in it"' 


print foo.split(',') 
#but this has the caveat that you don't have any ','s within your input as those will become delimitation points as well, which you do not want. 

在這種特殊情況下，你也可以匹配的發言權「」 但是這也將失敗，因爲你的輸入有一個元素title with , and "any，這將是不正確的拆分。

而在這種情況下，我們可以使用shlex和使用它的方法split。現在，這種拆分方法將使用空格來設置分隔符。

那麼，這樣做的：

print [_ for _ in shlex.split(foo)] 

會給我們一些更接近我們想要的東西，但不完全：

>>> ['https://test.com,', '2017-08-14,', 'This is the title with , and anything in it,', 'This is the paragraph also with , and anything in it'] 

可以看出，它在要素討厭逗號，我們不想要。

不幸的是，我們不能做

print [_[:-1] for _ in shlex.split(foo)] 

爲將切斷在 '它' 最後 'T'，但我們可以使用內置的字符串在

rstrip 

方法

和匹配任何逗號在每個元件的端部：

print [_.rstrip(',') for _ in shlex.split(foo)] 

給輸出：

>>> ['https://test.com', '2017-08-14', 'This is the title with , and anything in it', 'This is the paragraph also with , and anything in it'] 

這是非常接近我們想要什麼，但不完全是！ （缺少的「圍繞‘什麼’ - shlex吃掉這件事！）

但是，我們非常接近，我會離開，輕微珍聞爲你的功課，你應該嘗試的解決方案。首先像其他人發佈的那樣。

資源：

https://www.tutorialspoint.com/python/string_split.htm

https://docs.python.org/2/library/shlex.html

附：提示：也看看csv模塊。