Bug 55589 – Parenthetical assertions don't work correctly with YARR Interpreter

• Status: RESOLVED
• Resolution: FIXED
• Component: JavaScriptCore

[Peter Varga]

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.

[Gavin Barraclough]

These test cases have all since been fixed in the YARR interpreter.