正则表达式在记事本++中查找并替换每第n次出现[重复]答案

【问题标题】：regex find and replace every nth occurrence in notepad++ [duplicate]正则表达式在记事本++中查找并替换每第n次出现[重复]
【发布时间】：2019-07-23 03:16:28
【问题描述】：

我有一个大文本文件（15000 行）。每行以 /txt 结尾我想每 5 行更改一次以 txt5 结尾。我搜索了互联网，但没有找到适合我的解决方案。

somethingDifferent/txt
somethingDifferent/txt
somethingDifferent/txt
somethingDifferent/txt
somethingDifferent/txt
somethingDifferent/txt
somethingDifferent/txt
somethingDifferent/txt
somethingDifferent/txt
somethingDifferent/txt

到：

somethingDifferent/txt
somethingDifferent/txt
somethingDifferent/txt
somethingDifferent/txt
somethingDifferent/txt5
somethingDifferent/txt
somethingDifferent/txt
somethingDifferent/txt
somethingDifferent/txt
somethingDifferent/txt5

【问题讨论】：

@WiktorStribiżew：这并不完全是重复的，因为它不处理源文件中的换行符。诚然，这是一个相当微不足道的问题。

标签： javascript regex notepad++

【解决方案1】：

用 EditPadPro 测试过，但这也应该在 Notepad++ 中工作：

搜索

((?:^.*/txt\r\n){4}^.*/txt$)

替换为

\15

说明：

(           # Start capturing group no. 1, referenced by \1 in the replacement expression
 (?:        # Start a non-capturing group that matches...
  ^.*/txt   # a complete line ending in /txt
  \r\n      # and a (Windows-style) carriage return
 ){4}       # four times in a row.
 ^.*/txt$   # Then match a fifth line just like that, but without the CR
)           # End of capturing group

【讨论】：

很好的答案，您能否解释一下 \1 的替换方式？