Ruby 用单反斜杠替换双反斜杠 [英] Ruby replace double backslash with single backslash

问题描述

我似乎无法在 Ruby 中用单个反斜杠替换双反斜杠.我想我可以用另一个反斜杠来逃避反斜杠.

I cannot seem to replace a double backslash with a single backslash in Ruby. I figured I would just escape the backslashes with another backslash.

1.9.3-p194 :001 > line = "this\\is\\a\\test"
  => "this\\is\\a\\test"
1.9.3-p194 :002 > line.gsub("\\\\", "\\")  # Nothing
  => "this\\is\\a\\test"

那行不通，所以我决定尝试找到至少可以替代的匹配项.

That didn't work so I decided to try and find a match that at least makes a replacement.

1.9.3-p194 :003 > line.gsub("\\", "_")  # This works for replacing \\
  => "this_is_a_test"
1.9.3-p194 :004 > line.gsub("\\", "\\")  # Nothing
  => "this\\is\\a\\test" 

我仍然找不到在 Ruby 中执行此操作的简单方法.

I still cannot find an easy way to do this in Ruby.

推荐答案

有了这行...

line = "this\\is\\a\\test"

...您实际上创建了一个如下所示的字符串:

... you actually create a string looking like this:

this\is\a\test

... 因为每个 \\ 将被识别为单个斜杠.当然，您将无法替换双斜线，因为您的字符串中没有.

... as each \\ will be recognized as a single slash. Of course, you won't be able to replace double slashes, as there's none in your string.

line.gsub("\\", "_") 行就是这样做的:用 _<替换字符串中的所有 single 斜线/code> 符号.

line.gsub("\\", "_") line is doing just that: replacing all the single slashes in your string with _ symbol.

line.gsub("\\", "\\") 只是伪装的空操作.

这篇关于Ruby 用单反斜杠替换双反斜杠的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！