[ruby-core:103815] [Ruby master Bug#14367] Wrong interpretation of backslash C in regexp literals

Issue #14367 has been updated by jeremyevans0 (Jeremy Evans).


nobu (Nobuyoshi Nakada) wrote in #note-7:
> Agree that the previous behavior might not be intentional, but commit:11ae581a4a7f5d5f5ec6378872eab8f25381b1b9 also seems something broken on other than US-ASCII encoding.
> 
> ```
> $ LANG=en_US.UTF-8 ./ruby -vce '/\c\xFF/'
> ruby 3.1.0dev (2021-05-13T01:55:43Z master 11ae581a4a) [x86_64-darwin19]
> -e:1: invalid multibyte escape: /\x9F/
> -e:1: warning: possibly useless use of a literal in void context
> ```

The previous behavior also ended up with a regexp which matches a 8-bit character, so maybe Ruby should have given the same error before? Alternatively, I can revert if that is better?

----------------------------------------
Bug #14367: Wrong interpretation of backslash C in regexp literals
https://bugs.ruby-lang.org/issues/14367#change-91932

* Author: shyouhei (Shyouhei Urabe)
* Status: Closed
* Priority: Normal
* ruby -v: ruby 2.6.0dev (2018-01-16 trunk 61875) [x86_64-darwin15]
* Backport: 2.3: UNKNOWN, 2.4: UNKNOWN, 2.5: UNKNOWN
----------------------------------------
Following ruby code returns nil.

```sh
% LC_ALL=C ruby -ve 'p(/\c\xFF/ =~ "\c\xFF")'
ruby 2.6.0dev (2018-01-16 trunk 61875) [x86_64-darwin15]
nil
```

Is this intentional?



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