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https://issues.apache.org/jira/browse/XERCESC-1816?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12613678#action_12613678
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David Bertoni commented on XERCESC-1816:
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I don't think the non-Schema mode was originally meant to implement the XPath
2.0 version of REs, although I did some work a while back for better
compatibility with that recommendation. Given the history of the code (it was
ported from an earlier version of Xerces-J) and the lack of documentation, it's
hard to know what the intentions were, but some of the code was trying to
implement Perl-compatible regular expressions (PCRE).
I would be in favor of just declaring the non-Schema mode to be XPath
2.0-compatible mode, unless we really feel some need for a separate
Perl-compatible mode. Isn't that the easiest choice going forward?
I'm not sure the world needs another PCRE implementation, and Xerces-C is
certainly not the code base for it anyway.
> Multi-character escape classes don't work correctly in regular expressions
> --------------------------------------------------------------------------
>
> Key: XERCESC-1816
> URL: https://issues.apache.org/jira/browse/XERCESC-1816
> Project: Xerces-C++
> Issue Type: Bug
> Components: Validating Parser (XML Schema)
> Affects Versions: 2.8.0, 3.0.0
> Reporter: John Snelson
>
> The regular expressions "\i", "\I", "\c" and "\C" do not work as specified in
> the XML Schema specification:
> http://www.w3.org/TR/xmlschema-2/#nt-MultiCharEsc
> In fact, "\I" and "\C" cause an infinite loop during the parsing of the
> regular expression, "\i" seems to only match the letter "i", and "\c" gives
> the error:
> A character in U+0040-U+005f must follow '\c'.
> I'd be happy to attempt to fix this bug, but I need some guidance as to what
> the code for "\c" is actually meant to be doing.
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