Ruby on rails Ruby gsub字符串中的多个字符

使用Ruby 1.9.3和Rails 3.2，我有以下几点：

"every good boy does fine".gsub("every", "all").gsub("boy", "girl").gsub("fine", "well")
# => "all good girl does well"

有没有更好的方法写这个？谢谢

replacements = [ ["every", "all"], ["boy", "girl"],["fine", "well"]
replacements.each {|replacement| str.gsub!(replacement[0], replacement[1])}

我不知道它是否更好，但是更干净。

这将是很好的选择

a = "every good boy does fine"
h = {"every" => "all","boy" => "girl", "fine" =>"well" }
a.gsub(/\w+/) { |m| h.fetch(m,m)}
# => "all good girl does well"

或者

---

如果目的是避免方法链接：

[9] pry(main)> "every good boy does fine".gsub("every", "all").gsub("boy", "girl").gsub("fine", "well")
=> "all good girl does well"
[10] pry(main)> "every good boy does fine".gsub(/(every)|(boy)|(fine)/) do |word|
[10] pry(main)*   case word
[10] pry(main)*   when "every"
[10] pry(main)*     "all"
[10] pry(main)*   when "boy"
[10] pry(main)*     "girl"
[10] pry(main)*   when "fine"
[10] pry(main)*     "well"
[10] pry(main)*   end
[10] pry(main)* end
=> "all good girl does well"

或者：

[11] pry(main)> REPLACEMENT = { "every" => "all", "boy" => "girl", "fine" => "well"}
=> {"every"=>"all", "boy"=>"girl", "fine"=>"well"}
[12] pry(main)> "every good boy does fine".gsub(/(every)|(boy)|(fine)/) { |word| REPLACEMENT[word] }
=> "all good girl does well"

只要这样做：

“每个好男孩都做得很好”。gsub（/\w+/，“每个”=>“所有”，“男孩”=>“女孩”，“好”=>“很好”）

更容易阅读：） 这个简单问题的一些答案真的让我好奇…哈哈

以下是参考资料：

---

gg

subs[m]| | m

远远好于

h.has_key？（m）？h[m]：m

。。我忘了，但你提醒我：）

subs.default\u proc=->（h，k）{k}

是另一个选项，那么你可以说

{m | subs[m]}

并隐藏

default\u proc

@muistooshort More better is

a.gsub（/\w+/）{m | h.fetch（m，m）}

：）看看我的编辑。巧妙地使用了

Regexp union

，但是

'no-finerboy（Regexp.union（*h.keys），h）

->

“没有好女孩”

我发现我最初的方法虽然不是最好的，但更具可读性。不过，感谢您的指导。：）

[11] pry(main)> REPLACEMENT = { "every" => "all", "boy" => "girl", "fine" => "well"}
=> {"every"=>"all", "boy"=>"girl", "fine"=>"well"}
[12] pry(main)> "every good boy does fine".gsub(/(every)|(boy)|(fine)/) { |word| REPLACEMENT[word] }
=> "all good girl does well"

subs = { "every" => "all", "boy" => "girl", "fine" => "well" }
"every good boy does fine".gsub(/\w+/) { |m| subs[m] || m }
# => 'all good girl does well'