From: Brian Candler <b.candler@...>
Date: 2009-07-22T17:02:05+09:00
Subject: Re: Byte–stream parsing in Ruby

Incidentally, I needed to do something similar in ruby-1.8 recently, and 
it was very straightforward.

  def is_utf8?(str)
    Iconv.iconv('UTF-8','UTF-8',str)
    true
  rescue Iconv::IllegalSequence
    false
  end
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