ruby-on-rails – 如何检查字符是否为utf-8

如何通过 ruby | ror检查字符集是否采用utf-8编码？

解决方法

在 Ruby和其他任何地方都没有明确的方法可以做到这一点：

str = 'foo' # start with a simple string
# => "foo" 
str.encoding
# => #<Encoding:UTF-8> # which is UTF-8 encoded
str.bytes.to_a
# => [102,111,111] # as you can see,it consists of three bytes 102,111 and 111
str.encode!('us-ascii') # Now we will recode the string to 8-bit us-ascii encoding
# => "foo" 
str.encoding
# => #<Encoding:US-ASCII> 
str.bytes.to_a
# => [102,111] # see,same three bytes
str.encode!('windows-1251') # let us try some cyrillic
# => "foo" 
str.encoding
# => #<Encoding:Windows-1251> 
str.bytes.to_a
# => [102,the same three again!

当然,您可以对文本进行一些统计分析,并消除文本无效的编码,但从理论上讲,这不是可解决的问题.

原文地址：https://www.jb51.cc/ruby/267402.html