From: "jeremyevans0 (Jeremy Evans)" <noreply@...>
Date: 2021-09-03T18:21:48+00:00
Subject: [ruby-core:105143] [Ruby master Bug#18149] Can't match against strings with special codes within

Issue #18149 has been updated by jeremyevans0 (Jeremy Evans).

Status changed from Open to Rejected

That's because that is an invalid byte sequence, at least if the string's encoding is UTF-8.  If the string's encoding is not UTF-8, it works fine:

```
$ ruby -e 'p "\xFF".encoding'
#<Encoding:ASCII-8BIT>
$ ruby -Ku -e 'p "\xFF".encoding'
#<Encoding:UTF-8>

$ ruby -e 'p "\xFF".match(/\\x/)' 
nil
$ ruby -Ku -e 'p "\xFF".match(/\\x/)'
-e:1:in `match': invalid byte sequence in UTF-8 (ArgumentError)
        from -e:1:in `match'
        from -e:1:in `<main>'
```

You can force the string encoding to binary to avoid the ArgumentError:

```
$ ruby -Ku -e 'p "\xFF".b.match(/\\x/)'
nil
```

So I don't think this is a bug, I believe the behavior is expected.

----------------------------------------
Bug #18149: Can't match against strings with special codes within
https://bugs.ruby-lang.org/issues/18149#change-93550

* Author: chucke (Tiago Cardoso)
* Status: Rejected
* Priority: Normal
* ruby -v: 3.0.1
* Backport: 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN
----------------------------------------
This can be summed up by the following example:

```ruby
"\xFF".match /\\x/
#=> (irb):6:in `match': invalid byte sequence in UTF-8 (ArgumentError)
```



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