[Bug 5778] New: regex: "{" is a valid Char

http://www.w3.org/Bugs/Public/show_bug.cgi?id=5778

           Summary: regex: "{" is a valid Char
           Product: XML Schema
           Version: 1.0 only
          Platform: PC
        OS/Version: Windows NT
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Datatypes: XSD Part 2
        AssignedTo: cmsmcq@w3.org
        ReportedBy: mike@saxonica.com
         QAContact: www-xml-schema-comments@w3.org


According to the regex grammar for 1.0, the characters "{" and "}" are valid
instances of Char. This means that the parse for a{2} is ambiguous, and there
is a parse for a{,2} despite the fact that we have a Note saying it is invalid.

See also bug #2216 and bug #4010

Raised during the Schema WG meeting as a side-effect of closing bug #4010


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