Delphi JS Interpreter Lookbehind Regex problem

I'm trying to find JS interpreter for delphi that can execute this code.

const regex1 = /(?<=[a-z])[0-9]+/gm;

I've tried these interpreters:

JSEngine || Result of JSEngine

v8delphiwrapper || Result of v8delphiwrapper

Tried through OleObject Result (Message shows "Syntax error")

Also problem is that i need to execute script in multithread, so i can't use WebBrowser