[ruby-core:81913] [Ruby trunk Bug#13716] Unexpected or undocumented (or maybe both) behaviour when mixing String#scan with named captures

From: shyouhei@...
Date: 2017-07-05 06:56:32 UTC
List: ruby-core #81913
Issue #13716 has been reported by shyouhei (Shyouhei Urabe).

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Bug #13716: Unexpected or undocumented (or maybe both) behaviour when mixing String#scan with named captures
https://bugs.ruby-lang.org/issues/13716

* Author: shyouhei (Shyouhei Urabe)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.5.0dev (2017-06-22 trunk 59146) [x86_64-darwin15]
* Backport: 2.2: UNKNOWN, 2.3: UNKNOWN, 2.4: UNKNOWN
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Is this intentional?

```
[1] pry(main)> "1q2w3e4r".scan(/(\w\d)(foo){0}/)
=> [["q2", nil], ["w3", nil], ["e4", nil]]
[2] pry(main)> "1q2w3e4r".scan(/(\w\d)(?<foo>foo){0}/)
=> [[nil], [nil], [nil]]
```

The only difference is the capture being named.



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