插入转义字符 [英] Inserting Escape Characters

问题描述

我想用转义字符值替换和插入转义字符序列，同时考虑到 '\' 会使转义字符无效.

I want to replace and insert escape character sequences with their escape character values, also taking into account that '\' nullifies the escape character.

例如

"This is a \n test. Here is a \\n which represents a newline"

在 Ruby 中实现这一目标的最简单方法是什么?

What is the easiest way to achieve this in Ruby?

推荐答案

我假设您正在讨论以下问题:

I assume you are reffering to the following problem:

"\\n".gsub(/\\\\/, "\\").gsub(/\\n/, "\n") # => "n"
"\\n".gsub(/\\n/, "\n").gsub(/\\\\/, "\\") # => "\\\n"

String#gsub 可以接受一个块参数，它执行替换.

String#gsub can take a block argument, which performs the substitution.

str.gsub(/\\(.)/) do |s|
  case $1
  when "n"
    "\n"
  when "t"
    "\t"
  else
    $1
  end
end

这样就不会先替换特殊的转义序列，一切都按预期进行.

This way no special escape sequence is substituted first and everything works as expeted.

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