Bug #18149: Can't match against strings with special codes within

• Status: Rejected
• Priority: Normal
• Assignee: -
• Target version: -
• ruby -v: 3.0.1
• Backport: 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN

[chucke (Tiago Cardoso)]

This can be summed up by the following example:

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

[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.

[chucke (Tiago Cardoso)]

Thx for the reply. I think that's reasonable.