[ruby-core:112223] [Ruby master Bug#19417] Regexp \p{Word} and [[:word:]] do not match Unicode Other_Number character

Issue #19417 has been reported by ObjectBoxPC (Philip Chung).

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Bug #19417: Regexp \p{Word} and [[:word:]] do not match Unicode Other_Number character
https://bugs.ruby-lang.org/issues/19417

* Author: ObjectBoxPC (Philip Chung)
* Status: Open
* Priority: Normal
* ruby -v: 3.2.0
* Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN
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According to the [documentation for Regexp](https://ruby-doc.org/3.2.0/Regexp.html), `\p{Word}` and `[[:word:]]` both match a character in one of the following Unicode general categories: Letter, Mark, Number, Connector_Punctuation. However, neither matches U+00B2, which is in the Other_Number category (which is a subcategory of Number).

``` ruby
puts "Ruby version: %s" % RUBY_VERSION
puts "\p{Word} matches? %s" % /\p{Word}/u.match?("\u00B2")
puts "[[:word:]] matches? %s" % /[[:word:]]/u.match?("\u00B2")
puts "Is a Number charater? %s" % /\p{Number}/u.match?("\u00B2")
puts "Is an Other_Number character? %s" % /\p{Other_Number}/u.match?("\u00B2")
```

Expected output:

```
Ruby version: 3.2.0
p{Word} matches? true
[[:word:]] matches? true
Is a Number charater? true
Is an Other_Number character? true
```

Actual output:

```
Ruby version: 3.2.0
p{Word} matches? false
[[:word:]] matches? false
Is a Number charater? true
Is an Other_Number character? true
```

I notice that the [upstream Onigmo library doc](https://github.com/k-takata/Onigmo/blob/master/doc/RE) defines the `[[:word:]]` class as "Letter | Mark | Decimal_Number | Connector_Punctuation", meaning that it only matches certain number characters (which would exclude U+00B2). I am not sure how `\p{Word}` is defined though. But perhaps the documentation needs to be changed?



-- 
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