(rb_reg_named_captures): new method Regexp#named_captures
(match_regexp): new method MatchData#regexp.
(match_names): new method MatchData#names.
* lib/pp.rb (MatchData#pretty_print): show names of named captures.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@14163 b2dd03c8-39d4-4d8f-98ff-823fe69b080e