define: DUK_USE_ES6_REGEXP_SYNTAX
introduced: 2.0.0
default: true
tags:
  - ecmascript2015
description: >
  Enable support for additional RegExp syntax from E6 Section B.1.4, such as:
  (1) dollar escape, (2) unescaped curly braces ('{' and '}'), and (3)
  unescaped right bracket (']').  This option does not enable all of the ES6
  syntax because not all of the extra syntax is implemented; rather, the option
  enables whatever ES6 extra syntax has been implemented so far.

  This option is recommended because a lot of existing code depends on literal
  regexp braces, and other non-ES5 constructs.