Bug #14707: String#scan(/\K/) has changed its behavior in ruby 2.5

• Status: Closed
• Assignee: -
• Target version: -
• ruby -v: ruby 2.5.1p59 (2018-03-31 revision 63049) [x86_64-darwin17]
• Backport: 2.3: DONTNEED, 2.4: DONTNEED, 2.5: DONE

[knu (Akinori MUSHA)]

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.

[nobu (Nobuyoshi Nakada)]

• Backport changed from 2.3: UNKNOWN, 2.4: UNKNOWN, 2.5: UNKNOWN to 2.3: DONTNEED, 2.4: DONTNEED, 2.5: REQUIRED

[nobu (Nobuyoshi Nakada)]

• Status changed from Open to Closed

Applied in changeset trunk|r63252.

---

string.c: fix scanned substring with \K

• string.c (scan_once): fix the matched substring with \K, the
  beginning of that string may differ from the matched position.
  [ruby-core:86663] [Bug #14707]

[nagachika (Tomoyuki Chikanaga)]

• Backport changed from 2.3: DONTNEED, 2.4: DONTNEED, 2.5: REQUIRED to 2.3: DONTNEED, 2.4: DONTNEED, 2.5: DONE

ruby_2_5 r64320 merged revision(s) 63252.