Config option changes for regexp bracket parsing

config/config-options/DUK_USE_ES6_REGEXP_BRACES.yaml

@@ -1,15 +1,9 @@
 define: DUK_USE_ES6_REGEXP_BRACES
 feature_enables: DUK_OPT_ES6_REGEXP_BRACES
 introduced: 1.5.0
+removed: 2.0.0
 default: true
 tags:
   - ecmascript6
 description: >
-  Enable support for unescaped '{' and '}' literals in regular expressions,
-  which is an ES6 Appendix feature (and non-standard before ES6).  Ecmascript
-  E5 requires literal curly braces to be escaped, but most Ecmascript engines
-  support them when they are not used in valid quantifier, and this behavior
-  has been added to ES6 Appendix.
-
-  This option is recommended because a lot of existing code depends on literal
-  regexp braces.
+  Replaced by DUK_USE_ES6_REGEXP_SYNTAX.

config/config-options/DUK_USE_ES6_REGEXP_SYNTAX.yaml

@@ -0,0 +1,15 @@
+define: DUK_USE_ES6_REGEXP_SYNTAX
+feature_enables: DUK_OPT_ES6_REGEXP_SYNTAX
+introduced: 2.0.0
+default: true
+tags:
+  - ecmascript6
+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.

config/config-options/DUK_USE_NONSTD_REGEXP_DOLLAR_ESCAPE.yaml

@@ -1,12 +1,10 @@
 define: DUK_USE_NONSTD_REGEXP_DOLLAR_ESCAPE
 feature_enables: DUK_OPT_NONSTD_REGEXP_DOLLAR_ESCAPE
 introduced: 1.0.0
+removed: 2.0.0
 default: true
 tags:
   - ecmascript
   - compliance
 description: >
-  Enable support for non-standard regexp dollar escape "\$".  This option is
-  recommended because such regexps are used by existing code bases.
-
-  # FIXME: RST escaping works poorly now for backslash.
+  Replaced by DUK_USE_ES6_REGEXP_SYNTAX.

config/examples/compliance.yaml

@@ -8,6 +8,6 @@ DUK_USE_NONSTD_FUNC_SOURCE_PROPERTY: false
 DUK_USE_NONSTD_FUNC_STMT: false
 DUK_USE_NONSTD_GETTER_KEY_ARGUMENT: false
 DUK_USE_NONSTD_JSON_ESC_U2028_U2029: false
-DUK_USE_NONSTD_REGEXP_DOLLAR_ESCAPE: false
 DUK_USE_NONSTD_SETTER_KEY_ARGUMENT: false
 DUK_USE_NONSTD_STRING_FROMCHARCODE_32BIT: false
+DUK_USE_ES6_REGEXP_SYNTAX: false  # for ES5 compliance, disable ES6-only regexp extra syntax