[Webkit-unassigned] [Bug 188407] New: RegExp.exec returns wrong value with pattern "(?!(a)b)|ab"

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=188407

            Bug ID: 188407
           Summary: RegExp.exec returns wrong value with pattern
                    "(?!(a)b)|ab"
           Product: WebKit
           Version: Safari 11
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: isol2 at cin.ufpe.br

OS: Ubuntu 16.04 x64
jsc build version: 234689

Steps to reproduce:
t = new RegExp ("(?!(a)b)|ab").exec("ab");
print(t[0] == "ab");
print(t[1] == undefined);
print(t)

Actual results:
true
false
ab,a

Expected results:
true
true
ab,


V8, SpiderMonkey and Chakra works as expected.



cinfuzz

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