Issue #14707 has been reported by knu (Akinori MUSHA).

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Bug #14707: String#scan(/\K/) has changed its behavior in ruby 2.5
https://bugs.ruby-lang.org/issues/14707

* Author: knu (Akinori MUSHA)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.5.1p59 (2018-03-31 revision 63049) [x86_64-darwin17]
* Backport: 2.3: UNKNOWN, 2.4: UNKNOWN, 2.5: UNKNOWN
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It seems `\K` does not work as expected any more:

```
% ruby -ve 'p "a1 a2 a3".scan(/a\K./)'

ruby 2.3.7p456 (2018-03-28 revision 63014) [x86_64-darwin17]
["1", "2", "3"]

ruby 2.4.5p297 (2018-03-29 revision 63036) [x86_64-darwin17]
["1", "2", "3"]

ruby 2.5.1p59 (2018-03-31 revision 63049) [x86_64-darwin17]
["a1", "a2", "a3"]
```

I'm not sure if this is intended, but at least there is no mention for this in the NEWS file.



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