Ruby gsub字符串中的多个字符

Question

使用Ruby 1.9.3,Rails 3.2,我有以下内容:

"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.

Answer 1

String#gsub并且Hash#fetch将是本不错的选择.

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"

要么,

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"