HTMLEntities可以做到:

: jmglov@laurana; sudo gem install htmlentities
Successfully installed htmlentities-4.2.4
: jmglov@laurana;  irb
irb(main):001:0> require 'htmlentities'
=> []
irb(main):002:0> HTMLEntities.new.decode "¡I'm highly annoyed with character references!"
=> "¡I'm highly annoyed with character references!"

你可以使用htmlascii gem:

Htmlascii.convert string

如果你不想添加一个新的依赖项(比如HTMLEntities)，并且你已经在使用Hpricot，它可以为你进行转义和反转义。它处理的比CGI多得多:

Hpricot.uxs "foo bär"
=> "foo bär"

我认为Nokogiri宝石也是一个不错的选择。它非常稳定，有一个巨大的贡献社区。

样品:

a = Nokogiri::HTML.parse "foo bär"    
a.text 
=> "foo bär"

or

a = Nokogiri::HTML.parse "¡I'm highly annoyed with character references!"
a.text
=> "¡I'm highly annoyed with character references!"

HTMLEntities可以做到:

: jmglov@laurana; sudo gem install htmlentities
Successfully installed htmlentities-4.2.4
: jmglov@laurana;  irb
irb(main):001:0> require 'htmlentities'
=> []
irb(main):002:0> HTMLEntities.new.decode "¡I'm highly annoyed with character references!"
=> "¡I'm highly annoyed with character references!"

<% str="<h1> Test </h1>" %>

result: &lt; h1 &gt; Test &lt; /h1 &gt;

<%= CGI.unescapeHTML(str).html_safe %>