old_contents: def includeme(config):
      config.add_route('test.new.routes', '/test/new/routes/{param:[a-z]+}')
      config.add_route('blog.page', '/page/{page_slug}')
  
  
new_contents: def includeme(config):
      config.add_route('test.new.routes', '/test/new/routes/{param:[a-z]{1,}}')
      config.add_route('blog.page', '/page/{page_slug}')
  
  
subject: Use patterns with explicit length