Name can take one of three forms:

• String: This would normally take the form of a path like "pages/45/notes"
• Hash: Is treated as an implicit call to url_for, like { :controller => "pages", :action => "notes", :id => 45 }
• Regexp: Will destroy all the matched fragments, example:

  %r{pages/\d*/notes}

  Ensure you do not specify start and finish in the regex (^$) because the actual filename matched looks like ./cache/filename/path.cache Regexp expiration is only supported on caches that can iterate over all keys (unlike memcached).

Source Code

# File action_controller/caching/fragments.rb, line 110
def expire_fragment(key, options = nil)
  return unless cache_configured?

  key = key.is_a?(Regexp) ? key : fragment_cache_key(key)

  if key.is_a?(Regexp)
    self.class.benchmark "Expired fragments matching: #{key.source}" do
      cache_store.delete_matched(key, options)
    end
  else
    self.class.benchmark "Expired fragment: #{key}" do
      cache_store.delete(key, options)
    end
  end
end