class Middleman::Util::BlogTemplateProcessor

See github.com/sporkmonger/addressable/blob/master/lib/addressable/template.rb#L279<br><br>and has an extra-permissive default regex.
A special template processor that validates date fields

def self.match(name) 

def self.match(name)
  case name
  when 'year' then '\d{4}'
  when 'month' then '\d{2}'
  when 'day' then '\d{2}'
  else '.*?'
  end
end