Handle global flag in RexExp.exec() and .test().
Handle global flag in RexExp.exec() and .test().

Does not expose last flag to javascript code.

evanlabs/mujs,ccxvii/mujs,ccxvii/mujs,thurday/mujs,BOGY/mujs,earthling42/mujs,Frky/mujs,guiquanz/mujs,lsm/mujs,ccxvii/mujs,ccxvii/mujs