[Webkit-unassigned] [Bug 56082] New: Look-ahead assertions with back references don’t work as expected

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=56082

           Summary: Look-ahead assertions with back references don’t work
                    as expected
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Macintosh Intel
        OS/Version: Mac OS X 10.6
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: markus.wulftange at gmail.com


There seems to be a bug with look-ahead assertions that use a back reference:

     "P11".match(/^P([1-6])(?=\1)([1-6])$/)

This obviously should match as there is another 1 following the first 1 (matched string of the first group). In opposite to this, using a negated look-ahead assertion instead does match although there is another 1 following:

     "P11".match(/^P([1-6])(?!\1)([1-6])$/)

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