module AbstractController::Caching::Fragments

`delete_matched`, for Regexp keys).
`options` is passed through to the cache store's `delete` method (or


on caches that can iterate over all keys (unlike memcached).
`./cache/filename/path.cache`. Note: Regexp expiration is only supported
or `$`) because the actual filename matched looks like
might remove all notes. Make sure you don't use anchors in the regex (`^`
* Regexp - Will remove any fragment that matches, so `%r{pages/\d*/notes}`
'pages', action: 'notes', id: 45}`
* Hash - Treated as an implicit call to `url_for`, like `{ controller:
`pages/45/notes`.
* String - This would normally take the form of a path, like

`key` can take one of three forms:

Removes fragments from the cache.

def expire_fragment(key, options = nil)
  return unless cache_configured?
  key = combined_fragment_cache_key(key) unless key.is_a?(Regexp)
  instrument_fragment_cache :expire_fragment, key do
    if key.is_a?(Regexp)
      cache_store.delete_matched(key, options)
    else
      cache_store.delete(key, options)
    end
  end
end