python - 重复提取文本文件中两个分隔符之间的一行，Python

Question

我有一个以下格式的文本文件:

DELIMITER1
extract me
extract me
extract me
DELIMITER2

我想提取 .txt 文件中 DELIMITER1 和 DELIMITER2 之间 extract me 的每个 block

这是我当前的非执行代码:

import re
def GetTheSentences(file):
     fileContents =  open(file)
     start_rx = re.compile('DELIMITER')
     end_rx = re.compile('DELIMITER2')

     line_iterator = iter(fileContents)
     start = False
     for line in line_iterator:
           if re.findall(start_rx, line):

                start = True
                break
      while start:
           next_line = next(line_iterator)
           if re.findall(end_rx, next_line):
                break

           print next_line

           continue
      line_iterator.next()

有什么想法吗？

Answer 1

您可以使用 re.S 将其简化为一个正则表达式，DOTALL flag .

import re
def GetTheSentences(infile):
     with open(infile) as fp:
         for result in re.findall('DELIMITER1(.*?)DELIMITER2', fp.read(), re.S):
             print result
# extract me
# extract me
# extract me

这也利用了非贪婪运算符 .*?，因此将找到多个不重叠的 DELIMITER1-DELIMITER2 对 block 。