如何使用正則表達式提取否定句

Question

我有諸如數據：

實施例1

Barium swallow : There is slow transit to the stomach. 
There is lots of other stuff going on. 
There is no aspiration. 
Conclusion: Appearances are consistent with achalasia. 

實施例2

Barium swallow : There is slow transit to the stomach. 
There is no evidence of achalasia here. 
There is no aspiration. 
Conclusion: Normal study 

實施例3

Barium swallow : There is slow transit to the stomach. 
There is no reflux. 
There is no aspiration. 
Conclusion: Possible achalasia 

我想擺脫之間的詞但不限於一個行，以便與上面的例子中我得到

實施例1

Barium swallow : There is slow transit to the stomach. 
There is lots of other stuff going on. 
There is no aspiration. 
Conclusion: Appearances are consistent with achalasia. 

實施例2

Barium swallow : There is slow transit to the stomach. 
There is. 
There is no aspiration. 
Conclusion: Normal study 

實施例3

Barium swallow : There is slow transit to the stomach. 
There is no reflux. 
There is no aspiration. 
Conclusion: Possible achalasia 

要做到這一點（在R）我使用以下正則表達式：

[Nn]o.*[Aa]chalasia.*?(\\.\\n|\\.$) 

然而與此我得到：

實施例1對

Barium swallow : There is slow transit to the stomach. 
There is lots of other stuff going on. 
There is no 

實施例2

Barium swallow : There is slow transit to the stomach. 
There is no aspiration. 
Conclusion: Normal study 

實施例3

Barium swallow : There is slow transit to the stomach. 
There is no reflux. 
There is no 

Answer 1

嘗試此來代替。

/(?i)\s?no\s.*achalasia/

它不應該跨行匹配。

在Ruby：

string.gsub!(/(?i)\s?no\s.*achalasia/, '') 

Answer 2

您可以使用下面的正則表達式：

\bno(.*?)achalasia\b 

紅寶石

re = /\bno(.*?)achalasia\b/ 
str = 'Barium swallow : There is slow transit to the stomach. 
There is lots of other stuff going on. 
There is no aspiration. 
Conclusion: Appearances are consistent with achalasia. 
Barium swallow : There is slow transit to the stomach. 
There is no evidence of achalasia here. 
There is no aspiration. 
Conclusion: Normal study 
Barium swallow : There is slow transit to the stomach. 
There is no reflux. 
There is no aspiration. 
Conclusion: Possible achalasia 
There is no evidence of achalasia here.' 

# Print the match result 
str.match(re) do |match| 
    puts match.to_s 
end 

Answer 3

行，所以我想通了這一點。這個問題是不是正則表達式，而是使用GSUB有R爲你使用選項Perl的正則表達式時，事實= T

然後我用[Nn]o.*[Aa]chalasia.*?(\\.|$)

其中的伎倆