> For your convenience, I tell you two well-known incompatibilities:
> 
> - \d, \s and \w in Regexp does match *only* ASCII characters.
>   Especially, \w does NOT match with accented character, umlaut,
>   etc.  In other words, it behaves the same as 1.8.

Appears this has been the case for 1.9.1 with p378+

http://redmine.ruby-lang.org/issues/show/3181

As a suggestion, too, it might be nice to change functionality like this 
only on the release level, not the patch level, as this one apparently 
was.
Thanks!
-r
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