ES6 regular expressions unicode mode: case insensitivity case folding inconsistency #7708

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1. addaleax

   added

   v8 engineIssues and PRs related to the V8 dependency.Issues and PRs related to the V8 dependency.

   on Jul 13, 2016
2. vsemozhetbyt commented on Jul 13, 2016

   

   vsemozhetbyt

   on Jul 13, 2016

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   It seems here is the turning point:

   /(\.[\u00ffA-Z])+/i.test('a.c'); // true
   /(\.[\u0100A-Z])+/i.test('a.c'); // false
3. mscdex commented on Jul 13, 2016

   

   mscdex

   on Jul 13, 2016

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   I'm not familiar enough with the ES6 regexp changes, but FWIW adding the new /u flag makes the .test() return true.
4. mscdex

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   questionIssues asking questions about Node.js.Issues asking questions about Node.js.

   on Jul 13, 2016
5. vsemozhetbyt commented on Jul 13, 2016

   

   vsemozhetbyt

   on Jul 13, 2016

   Last edited by vsemozhetbyt

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   Well, that is weird. Node.js 6.3.0

   /(a[\u0100A-Z])+/i.test('aa'); \\ false
   /a([\u0100A-Z])+/i.test('aa'); \\ true
   
   /(a[\u0100A-Z])+/i.test('aa'); \\ false
   /(a[\u0100A-Z])/i.test('aa');  \\ true
   
   /(a[\u0100A-Z])+/i.test('aa'); \\ false
   /(a[\u00ffA-Z])+/i.test('aa'); \\ true
   
   /(a[\u0100A-Z])+/i.test('aa'); \\ false
   /(a[A-Z\u0100])+/i.test('aa'); \\ true
   
   /(a[\u0100A-Z])+/i.test('aa'); \\ false
   /(a[\u0100a-z])+/i.test('aa'); \\ true
   
   /(a[\u0100A-Z])+/i.test('aa'); \\ false
   /(a[\u0100A-Z])+/i.test('AA'); \\ true
6. targos commented on Jul 13, 2016

   

   targos

   on Jul 13, 2016

   Last edited by targos

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   Someone reported the bug upstream: https://bugs.chromium.org/p/v8/issues/detail?id=5199
7. hashseed commented on Jul 21, 2016

   

   hashseed

   on Jul 21, 2016

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   Issue has been fixed and ported back to V8 5.3 and 5.2. Please comment to the V8 issue if we need to merge this further back.

   👍React with 👍1Reacted by F. Hinkelmann
8. ofrobots commented on Jul 21, 2016

   

   ofrobots

   on Jul 21, 2016

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   Thank! The older V8 streams (5.1 and older) are no longer accepting merges upstream, so fixes would have to be floated for master (V8 5.1) and v6.x (V8 5.0). I believe @fhinkel is planning to submit PRs for the floats.
9. fhinkel commented on Jul 22, 2016

   

   fhinkel

   on Jul 22, 2016

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   Yes, working on it.
10. ofrobots

    closed this as completedin 60d46b4on Aug 3, 2016
11. ofrobots

    added a commit that references this issue on Aug 3, 2016

    deps: cherry-pick a51f429 from V8 upstream

    ...

    af63871
12. BethGriggs

    added a commit that references this issue on Aug 18, 2016

    deps: cherry-pick a51f429 from V8 upstream

    ...

    9f6189e
13. sjarmak

    added a commit that references this issue on Jul 27, 2026

    deps: cherry-pick a51f429 from V8 upstream

    ...

    60d46b4