Ruby 与“|”等特殊字符匹配错误答案

【问题标题】：Ruby matches wrong with special characters like "|"Ruby 与“|”等特殊字符匹配错误
【发布时间】：2016-04-17 03:42:36
【问题描述】：

代码：

arr = ["this is | a test","this is a second test","this must be a third test"]
res = ["this is | a test test test ","this is a second test test test","this must be a third test test test"]

result = Hash.new

arr.each do |c|
  res.each do |i|
    if (/#{c}/.match("#{i}" ))
      result["#{c}"] = i
    end
  end
end

puts result

结果：

["this is | a test" => "this is a second test test test",
 "this is a second test" => "this is a second test test test",
 "this must be a third test" => "this must be a third test test test"]

问题：

第一个匹配错误，“this is | a test”的最后一个匹配是“this is a second test”，我看到他先匹配第一个值，然后匹配第二个值。插入中断不是一种选择。我怎样才能确定与“|”的匹配完全匹配，所以我可以得到以下结果：

["this is | a test" => "this is | a test test test ",
 "this is a second test" => "this is a second test test test",
 "this must be a third test" => "this must be a third test test test"]

【问题讨论】：

无法复制。
为什么不使用反斜杠？
@c650 因为数组是动态的，我们永远不知道“|”是否以及何时字符将出现。

标签： arrays ruby regex match

【解决方案1】：

问题在于，在正则表达式中，x|y 具有 “匹配正则表达式中的 x 或 y” 的特殊含义。因此，

this is | a test

确实会匹配"**this is **a second test test test"

你可以使用Regex.escape:

/#{Regex.escape(c)}/

【讨论】：

感谢您的解决方案，就像一个魅力，解决方案：if (/#{Regexp.escape(c)}/.match("#{i}" ))