Issue #12577 has been updated by Nobuyoshi Nakada.

Description updated

----------------------------------------
Bug #12577: Is '$' punctuation or not? Inconsistency between us-ascii and UTF-8
https://bugs.ruby-lang.org/issues/12577#change-59566

* Author: Martin Drst
* Status: Open
* Priority: Normal
* Assignee: 
* ruby -v: ruby 2.4.0dev (2016-07-09 trunk 55618) [x86_64-cygwin]
* Backport: 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN
----------------------------------------
US-ASCII thinks '$' is punctuation. UTF-8 thinks it's not.

This means that the following two scripts:

```
# encoding: us-ascii
puts '$' =~ /\p{Punct}/ ? 'match' : 'no match'
```

and

```
# encoding: utf-8
puts '$' =~ /\p{Punct}/ ? 'match' : 'no match'
```

produce different results. It also means that the output from the single line script

```
puts '$' =~ /\p{Punct}/ ? 'match' : 'no match'
```

changed when we changed the default script encoding from US-ASCII to UTF-8.

This may be okay as it is, but I'm reporting it here to check what others think.



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