class String


‘“foo: %{bar}” % { :bar => 10 } # => “foo: 10”`.
to replace named capture groups, i.e.
This monkeypatch extends Ruby 1.8 {String#%} with an ability
@api public
#

def %(arg, *args) 

def %(arg, *args)
  if arg.is_a?(Hash)
    gsub(/%\{(\w+)\}/) do
      arg[$1.to_sym]
    end
  else
    original_percent(arg, *args)
  end
end