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https://issues.apache.org/jira/browse/XERCESC-1816?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12613253#action_12613253
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Alberto Massari commented on XERCESC-1816:
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>From what I can see, the \c, \C, \i and \I are implemented by the regex parser
>of Xerces-C, but only when you specify that you want to use the regex as
>defined by the XMLSchema specs (implemented in the ParserForXMLSchema.cpp
>file). The code that is listed here is for the "normal" regex, that I guess
>doesn't specify these XML-specific features.
> 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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