[Webkit-unassigned] [Bug 55589] New: Parenthetical assertions don't work correctly with YARR Interpreter

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=55589

           Summary: Parenthetical assertions don't work correctly with
                    YARR Interpreter
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: pvarga at webkit.org
                CC: barraclough at apple.com, msaboff at apple.com


The fast/regex/pcre-test-1 layout test fails with YARR Interpreter:
FAIL regex269.exec(input0); should be 12-sep-98. Was null.

The test case is:
regex269 = /(?=[^a-z]+[a-z])\d{2}-[a-z]{3}-\d{2}|(?![^a-z]+[a-z])\d{2}-\d{2}-\d{2}/;
var input0 = "12-sep-98";

It seems when a parenthetical assertion contains a term with a quantifier (+ or *) the YARR Interpreter 
doesn't match the subpattern correctly.

Here is a simpler example:
var str = "aab".match(/(?=a+b)aab/); 

result: null
expected: aab

These kind of patterns work well with YARR JIT.

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