[GR-59866] Support symbolize_names argument to MatchData#named_captures

PullRequest: truffleruby/4426

Author: andrykonchin

CHANGELOG.md

@@ -41,6 +41,7 @@ Compatibility:
 * Add `Dir.fchdir` (#3681, @andrykonchin).
 * Add `Dir#chdir` (#3681, @andrykonchin).
 * Declare `File::SHARE_DELETE` constant (#3745, @andrykonchin).
+* Support `symbolize_names` argument to `MatchData#named_captures` (#3681, @rwstauner).
 
 Performance:
 

spec/tags/core/matchdata/named_captures_tags.txt

@@ -91,7 +91,9 @@ def names
     regexp.names
   end
 
-  def named_captures
+  def named_captures(symbolize_names: false)
+    names = Primitive.regexp_names(self.regexp).map(&:first)
+    names.map!(&:to_s) unless symbolize_names
     names.collect { |name| [name, self[name]] }.to_h
   end