From: Brian Candler <b.candler@...>
Date: 2011-08-10T06:38:48+09:00
Subject: Re: Is \d supposed to match Unicode Numbers?

Gavin Kistner wrote in post #1015799:
> Is this the correct behavior for
> Ruby? Are the Oniguruma docs wrong? Am I misreading them? Do they not
> apply to how Oniguruma is used within Ruby?

irb(main):001:0> 
"0123456789٠١٢٣٤٥٦٧٨٩۰۱۲۳۴۵۶۷۸۹߀߁߂߃߄߅߆߇߈߉०१२३४५६७८९০১২৩৪৫৬৭৮৯੦੧੨…".scan(/\d/)
=> ["0", "1", "2", "3", "4", "5", "6", "7", "8", "9"]
irb(main):002:0> 
"0123456789٠١٢٣٤٥٦٧٨٩۰۱۲۳۴۵۶۷۸۹߀߁߂߃߄߅߆߇߈߉०१२३४५६७८९০১২৩৪৫৬৭৮৯੦੧੨…".scan(/[[:digit:]]/)
=> ["0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "٠", "١", "٢", 
"٣", "٤", "٥", "٦", "٧", "٨", "٩", "۰", "۱", "۲", "۳", "۴", "۵", "۶", 
"۷", "۸", "۹", "߀", "߁", "߂", "߃", "߄", "߅", "߆", "߇", "߈", "߉", "०", 
"१", "२", "३", "४", "५", "६", "७", "८", "९", "০", "১", "২", "৩", "৪", 
"৫", "৬", "৭", "৮", "৯", "੦", "੧", "੨"]
irb(main):003:0>

irb(main):004:0> "abcdé".scan(/\w/)
=> ["a", "b", "c", "d"]
irb(main):005:0> "abcdé".scan(/[[:alpha:]]/)
=> ["a", "b", "c", "d", "é"]

So I think it's intentional and consistent behaviour (for some 
definition of consistent):

* \w and \d match only Latin letters and digits
* [[:alpha:]] and [[:digit:]] match the full unicode set

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