PurgeOutputCacheEventHandler.cs

    //We are only listening to.
		private static IEnumerable<string> RemoteEventPatterns = new List<string>()
		{
			"EPLanguageData:([0-9]+)$",
			"EP:ContentVersion:([0-9]+)$",
			@"EPContentVersion:([0-9_]+)$"
		};

		private void ChangeEventOnRaised(object sender, EventNotificationEventArgs eventNotificationEventArgs)
		{
			string context = eventNotificationEventArgs.Param as string;

			if (String.IsNullOrWhiteSpace(context))
				return;

			foreach (string pattern in RemoteEventPatterns)
			{
				//Verify if the param matches one of our RemoteEvents
				bool foundMatch = Regex.IsMatch(context, pattern);

				//We will only do something when its a known event indicating content change
				if (!foundMatch)
					continue;

				Match match = Regex.Match(context, pattern);

				if (match.Groups.Count != 2)
					continue;

				var group = match.Groups[1];

				if (String.IsNullOrWhiteSpace(group.Value))
					continue;

				string contentReferenceId = group.Value;

				//Convert to a ContentReference
				ContentReference contentReference = new ContentReference(contentReferenceId);

				//Try and find a matching piece of content so we can resolve the template
				IContent content;

				bool found = this._contentRepository.TryGet(contentReference, out content);

				if (!found)
					continue;

				//Raise a purge for this content
				PurgeOutputCacheByContent(content);
			}

		}