如何将file2中的regex字符串匹配（逐个）替换为Python中类似file1中的相同匹配？

Question

我需要从一个结构化的.txt文件中复制regex匹配项，并将其粘贴到另一个类似的.txt文件中，以便从文件\u 1中找到的regex匹配项将用文件\u 1匹配项逐个替换文件\u 2中的相同匹配项？你知道吗

带有替换字符串的文本文件示例：

#TXT file 1:

randomtext_randomtext_randomtext_randomtext_new_STRING_Arandomtext_
randomtext_randomtext_new_STRING_Brandomtext_randomtext_randomtext_
randomtext_randomtext_randomtext_randomtext_randomtext_randomtext_
new_STRING_Crandomtext_randomtext_randomtext_randomtext_

#TXT file 2 (the exact same structure, but a little different strings values):

randomtext_randomtext_randomtext_randomtext_old_STRING_Arandomtext_
randomtext_randomtext_old_STRING_Brandomtext_randomtext_randomtext
_randomtext_randomtext_randomtext_randomtext_randomtext_randomtext_
old_STRING_Crandomtext_randomtext_randomtext_randomtext_

如何将使用regex找到的字符串：new \u STRING \u A、new \u STRING \u B和new \u STRING \u C从文件\u 1.txt复制到文件\u 2.txt中，以便使用相同的regex匹配：old \u STRING \u A、old \u STRING \u B、old \u STRING \u C，这样文件\u 1中的新字符串将替换文件\u 2中的旧字符串？你知道吗

Answer 1

不需要使用regex，只需要字符串比较函数

with open('file_1.txt') as f1 : 
  content = f1.readlines() 
  content = [x.strip() for x in content] 

with open('file_2.txt') as f2 : 
  content2 = f2.readlines() 
  content2 = [x.strip() for x in content] 

for line in content : 
  for line2 in content2 : 
      if 'old_STRING_A' in line2 and 'old_STRING_A' in line1 :
       line2 = line1 
      elif 'old_STRING_B' in line2 and 'old_STRING_B' in line1 :
       line2 = line1 
      elif 'old_STRING_C' in line2 and 'old_STRING_C' in line1 :
       line2 = line1 

with open('file_2.txt', 'w') as f2:
    for line in content2 : 
      f2.write(line+'\n')

使用正则表达式

import re 

with open('file_1.txt') as f1 : 
  content = f1.readlines() 
  content = [x.strip() for x in content] 

with open('file_2.txt') as f2 : 
  content2 = f2.readlines() 
  content2 = [x.strip() for x in content] 

for line in content : 
  for line2 in content2 : 
      re.sub(r'[^]?old_STRING_A[^]?','new_STRING_A',line)

with open('file_2.txt', 'w') as f2:
    for line in content2 : 
      f2.write(line+'\n')

Answer 2

我有这样的东西，但它不起作用。我的目标是：

1. 使用Regex搜索文件1中的字符串
2. 使用相同的正则表达式搜索文件2中的字符串
3. 将文件1中找到的匹配项替换为文件2中找到的匹配项

file1 = r'C:\Users\file_1.txt'
file2 = r'C:\Users\file_2.txt'


with open(file2) as f1 : 
 content = f1.readlines() 
 content = [x.strip() for x in content] 

with open(file1) as f2 : 
 content2 = f2.readlines() 
 content2 = [x.strip() for x in content] 

for line in content : 
 for line2 in content2 : 
     re.sub(r'[^]?old_STRING_A[^]?',r'[^]?new_STRING_A[^]?',line)

with open(file1, 'w') as f2:
   for line in content2 : 
     f2.write(line+'\n')