Page: 1 Regexp.new('2.0.0') Ruby 2.0.0 での正規表現の新機能 西山和広 日本Rubyの会 Powered by Rabbit 2.1.1 Page: 2 Onigmo Onigmo (Oniguruma-mod) NEWS of Ruby 2.0.0 says following only: Merge Onigmo https://github.com/k-takata/Onigmo Details are unknown 詳細不明 1/12 Page: 3 New feature (1) \K examples without /\K/ "foobar".sub(/(?<=foo)bar/, "") #=> "foo" "foobar".sub(/(?<=fo*)bar/, "") # SyntaxError: invalid pattern in