Ruby gsub 字符串中的多个字符 [英] Ruby gsub multiple characters in string

问题描述

使用 Ruby 1.9.3、Rails 3.2，我有以下内容:

Using Ruby 1.9.3, Rails 3.2, I have the following:

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

有没有更好的方法来写这个?谢谢.

Is there a better way to write this? Thanks.

推荐答案

String#gsub 和 Hash#fetch 将是不错的选择.

String#gsub and Hash#fetch will be the good choice for this.

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，

a = "every good boy does fine"
h = {"every" => "all","boy" => "girl", "fine" =>"well" }
Regexp.new("^#{h.keys.join('|')}$") # => /^every|boy|fine$/
a.gsub(Regexp.new("^#{h.keys.join('|')}$"),h)
# => "all good girl does well"

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