使用Ruby 1.9.3,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"
有没有更好的方法来写这个？谢谢.
解决方法
String#gsub和
Hash#fetch将是不错的选择.
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","fine" =>"well" }
Regexp.new("^#{h.keys.join('|')}$") # => /^every|boy|fine$/
a.gsub(Regexp.new("^#{h.keys.join('|')}$"),h)
# => "all good girl does well"