如何提取單詞與其下一次出現之間的文本？

Question

我有以下示例文本：

mystr = r'''\documentclass[12pt]{article} 
\usepackage{amsmath} 
\title{\LaTeX} 
\begin{document} 
\section{Introduction} 
This is introduction paragraph 
\section{Non-Introduction} 
This is non-introduction paragraph 
\section{Sample section} 
This is sample section paragraph 
\begin{itemize} 
    \item Item 1 
    \item Item 2 
\end{itemize} 
\end{document}''' 

我試圖做到的是創建一個正則表達式，會從mystr提取以下各行：

['This is introduction paragraph','This is non-introduction paragraph',' This is sample section paragraph\n \begin{itemize}\n\item Item 1\n\item Item 2\n\end{itemize}'] 

Answer 1

可以使用split從str方法：在

my_string = "a quick brown fox jumps over a lazy dog than a quick elephant" 
word = "a " 
my_string.split(word) 

結果：

['', 'quick brown fox jumps over ', 'lazy dog than ', 'quick elephant'] 

注：不要使用str作爲變量名，因爲它是一個Python關鍵字。

Answer 2

由於任何原因你需要使用正則表達式。也許分裂字符串比「a」更多參與。該re模塊具有分割功能太：

import re 
str_ = "a quick brown fox jumps over a lazy dog than a quick elephant" 


print(re.split(r'\s?\ba\b\s?',str_)) 

# ['', 'quick brown fox jumps over', 'lazy dog than', 'quick elephant'] 

編輯：擴大答案與你提供的新資料...

您的編輯後在你寫你的問題，你有更好的說明包括一個看起來像LaTeX的文本，我認爲你需要提取那些不以\開頭的行，這些是乳膠命令。換句話說，你需要只有文本的行。嘗試以下操作，始終使用正則表達式：

import re 

mystr = r'''\documentclass[12pt]{article} 
\usepackage{amsmath} 
\title{\LaTeX} 
\begin{document} 
\section{Introduction} 
This is introduction paragraph 
\section{Non-Introduction} 
This is non-introduction paragraph 
\section{Sample section} 
This is sample section paragraph 
\end{document}''' 

pattern = r"^[^\\]*\n" 


matches = re.findall(pattern, mystr, flags=re.M) 

print(matches) 

# ['This is introduction paragraph\n', 'This is non-introduction paragraph\n', 'This is sample section paragraph\n']