Regex patterns beginning with "(?"

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        The W3C issue http://www.w3.org/Bugs/Public/show_bug.cgi?id=4016 states that Regex patterns beginning with "(?" are invalid.
        Attached schema has the regex pattern "^a (?#xxx) (?#yyy) {3}c" that should be invalid for schema compiler but the regex is valid

              Assignee:
              Joe Wang
              Reporter:
              Leonid Kuskov
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