From: Brian Candler <b.candler@...>
Date: 2010-06-16T00:56:21+09:00
Subject: Re: gsub: invalid byte sequence in US-ASCII

R.. Kumar wrote:
> If i replace ruby with perl -pe 's|....|g' that works fine.

Replacing ruby 1.9.x with ruby 1.8.x is just as effective, and I would 
recommend this for maintaining your sanity.

I can only guess that the external encoding picked up from your 
platform's environment is US-ASCII (are you using cygwin by any chance?)

You probably need to set the external encoding to UTF-8 or BINARY for 
your regexp not to crash. Try adding -Ku or -Kn to your ruby command 
line.

If you want to attempt to understand String encoding in ruby 1.9, then 
good luck to you. I tried, documented what I found here:
http://github.com/candlerb/string19/blob/master/string19.rb
and gave up after about 200 rules. There is no official documentation.
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