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[Bug 866874] Re: regex "range subtraction" not supported

To: zorba-coders@xxxxxxxxxxxxxxxxxxx
From: "Paul J. Lucas" <866874@xxxxxxxxxxxxxxxxxx>
Date: Thu, 22 Dec 2011 18:15:51 -0000
Reply-to: Bug 866874 <866874@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

** Changed in: zorba
       Status: New => Triaged

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https://bugs.launchpad.net/bugs/866874

Title:
  regex "range subtraction" not supported

Status in Zorba - The XQuery Processor:
  Triaged

Bug description:
  XQuery regular expressions are based on those specified by "XML Schema
  Part 2: Datatypes Second Edition," Appendix F, "Regular Expressions."
  Said regexps support "Character Class Subtraction" as specified in
  section F.1, "[16] charClassSub."

  Zorba currently used ICU for Unicode regular expressions.
  Unfortunately, ICU doesn't support "Character Class Subtraction";
  hence the following W3C tests fail:

  caselessmatch10
  caselessmatch11

  This bug is more specific than bug 2988205 that will be closed and
  replaced by this bug and a few other more specific bugs.

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