具有嵌入变量的Ruby字符串

如何在yaml中存储嵌入式变量的 ruby字符串,但是只有从yaml获取字符串时才插入变量值？

解决方法

str = "Hi %{name},%{msg}. Bye %{name}." #yaml it,de-yaml it back to string
h = {:name=> "John",:msg=> "this message is for you"}
puts str % h
#=>Hi John,This message is for you. Bye John.