Regexp compilation error: lookbehind assertion is not fixed length

[EliteMasterEric]

Called from haxe.ui.util.StringUtil::boot haxe/ui/util/StringUtil.hx line 90
Called from EReg::new C:\Haxe\Haxe436\haxe\std/cpp/_std/EReg.hx line 33
Error : Regexp compilation error : lookbehind assertion is not fixed length in \B(?=(\d{3})+(?!\d))(?<!\.\d*)

Platform: Windows 10, HXCPP, Haxe v4.3.6.

This appears to be tied to the change made recently in #671. Reverting to a1faab7 resolves the error.

[ianharrigan]

should be fixed in latest, PR: #673