ruby 如何判断一个字符串编码是 gbk 还是 utf8

Question

ruby 如何判断一个字符串编码是 gbk 还是 utf8

Answer 1

UTF8编码和正则表达式

Answer 2

用第三方gem库，推荐rchardet或者uchardet

2.2.2 :001 > require 'rchardet'
 => true 
2.2.2 :002 > CharDet.detect('测试')
 => {"encoding"=>"utf-8", "confidence"=>0.7525} 
2.2.2 :003 > 

Answer 3

str="abc"
sty=str.encoding.name
if sty=="GBK"
   puts "gbk"
elsif sty="UTF-8"
   puts "utf8"
else
   puts "not gbk or utf8"
end