187759 2018-07-18 07:39:39 -0700 Inconsistent output compared with other JS engines 2018-07-20 19:46:39 -0700 1 1 1 Unclassified WebKit JavaScriptCore WebKit Local Build Unspecified Unspecified NEW P2 Normal --- 1 sunlili webkit-unassigned fpizlo ysuzuki oldest_to_newest 1442992 0 345244 sunlili 2018-07-18 07:39:39 -0700 Created attachment 345244 js source code Hello, Running js code in attachment, output in ChakraCore, V8 and SpiderMonkey is: ["",""] r.lastIndex=0 RegExp.${_,1,...,9}=["a","","","","","","","","",""] BT_FLAG But, JavaScriptCore is: ["",""] r.lastIndex=0 RegExp.${_,1,...,9}=["","","","","","","","","",""] BT_FLAG BT group 2018.7.18 345244 2018-07-18 07:39:39 -0700 2018-07-18 07:39:39 -0700 js source code 0001_739194.js application/javascript 4961 sunlili ZnVuY3Rpb24gZWNobyhvKSB7CiAgICB0cnkgewogICAgICAgIGRvY3VtZW50LndyaXRlKG8gKyAi PGJyLz4iKTsKICAgICAgICBlY2hvID0gZnVuY3Rpb24obykgeyBkb2N1bWVudC53cml0ZShvICsg 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