feat: support inline flags

Author: ValdezFOmar

grammar.js

@@ -68,6 +68,7 @@ module.exports = grammar({
         $.anonymous_capturing_group,
         $.named_capturing_group,
         $.non_capturing_group,
+        $.inline_flags_group,
       ),
       optional(choice(
         $.zero_or_more,
@@ -153,6 +154,19 @@ module.exports = grammar({
 
     non_capturing_group: $ => seq('(?:', $.pattern, ')'),
 
+    inline_flags_group: $ => seq(
+      '(?',
+      choice(
+        $.flags,
+        seq($.flags, '-', $.flags),
+        seq('-', $.flags),
+      ),
+      optional(seq(':', $.pattern)),
+      ')',
+    ),
+
+    flags: _ => /[a-zA-Z]+/,
+
     zero_or_more: quantifierRule(_ => '*'),
     one_or_more: quantifierRule(_ => '+'),
     optional: quantifierRule(_ => '?'),

queries/highlights.scm

@@ -41,6 +41,12 @@
     "," @punctuation.delimiter
   ])
 
+(inline_flags_group
+  "-"? @operator
+  ":"? @punctuation.delimiter)
+
+(flags) @character.special
+
 (character_class
   [
     "^" @operator