Backport #8583: A problem of condition regexp with a named capture

• Status: Closed
• Assignee: nagachika (Tomoyuki Chikanaga)

[ohai (Ippei Obayashi)]

以下の条件分岐を含む正規表現は "xy" "yx" にマッチし、"xx" "yy" にはマッチしません。
/\A((x)|(y))(?(2)y|x)\z/
名前付きキャプチャを用いた以下の正規表現も同じ挙動をするはずですが、そうはなっていません。
/\A((?x)|(?y))(?()y|x)\z/

"xx" "yy" にマッチして "xy" "yx" にはマッチしない。

2.0.0-p247, trunk の両方で確認しました。

この問題について調べた所、 名前付きキャプチャを使うときキャプチャの番号をrenumberしている
所で renumber がもれています。

添付したパッチのように修正すれば直ると思います。

[nagachika (Tomoyuki Chikanaga)]

• Backport changed from 1.9.3: UNKNOWN, 2.0.0: UNKNOWN to 1.9.3: UNKNOWN, 2.0.0: REQUIRED

[usa (Usaku NAKAMURA)]

• Backport changed from 1.9.3: UNKNOWN, 2.0.0: REQUIRED to 1.9.3: DONTNEED, 2.0.0: REQUIRED

[knu (Akinori MUSHA)]

Thank you. I've just reported this to the upstream with the given test cases: https://github.com/k-takata/Onigmo/pull/20

[knu (Akinori MUSHA)]

Onigmo 5.13.5 has been released, which includes the fix.

[naruse (Yui NARUSE)]

• Tracker changed from Bug to Backport
• Project changed from Ruby to 15
• Target version deleted (2.1.0)

Merged as r41764,41765

[nagachika (Tomoyuki Chikanaga)]

• Status changed from Open to Assigned
• Assignee set to nagachika (Tomoyuki Chikanaga)

[nagachika (Tomoyuki Chikanaga)]

• Status changed from Assigned to Closed
• % Done changed from 0 to 100

This issue was solved with changeset r41780.
Ippei, thank you for reporting this issue.
Your contribution to Ruby is greatly appreciated.
May Ruby be with you.

---

merge revision(s) 41764,41765,41767: [Backport #8583]

* regcomp.c (): Merge Onigmo 5.13.5 23b523076d6f1161.
  https://bugs.ruby-lang.org/issues/8583
  * [bug]  (thanks Akinori MUSHA and Ippei Obayashi)
           Fix a renumbering bug in condition regexp with a named
           capture. [Bug #8583]
  * [spec] (thanks Akinori MUSHA)
    Allow ENCLOSE_OPTION in look-behind.