From: Brian Candler <b.candler@...>
Date: 2009-08-12T19:13:58+09:00
Subject: Re: 1.9 String and M17N documentation

James Gray wrote:
> * Just FYI, you ask the following about Regexp::FIXEDENCODING:
> 
> # FIXME: What is the purpose of this flag?
> 
> I do try to explain that under Regexp Encodings in this article, if
> you are interested:
> 
> http://blog.grayproductions.net/articles/miscellaneous_m17n_details

"A fixed_encoding?() Regexp is one that will raise an 
Encoding::CompatibilityError if matched against any String that contains 
a different Encoding from the Regexp itself."

I think that's not exactly correct:

$ irb19 --simple-prompt
>> re = /gro/u
=> /gro/
>> re.encoding
=> #<Encoding:UTF-8>
>> re.fixed_encoding?
=> true
>> str = "gro".force_encoding("ISO-8859-1")
=> "gro"
>> re =~ str
=> 0

AFAICS, it will only raise an error if the matched string is of a 
different encoding *and* is not ascii_only?

>> str = "gro\xdf".force_encoding("ISO-8859-1")
=> "gro�"
>> re =~ str
Encoding::CompatibilityError: incompatible encoding regexp match (UTF-8 
regexp with ISO-8859-1 string)
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