Board Thread:Support Requests - Getting Technical/@comment-5068292-20150124035050/@comment-1142365-20150124075821

There is an extension which gives you a #substring parser function. A solution I'm seeing is to use the #substring function to get the first 4 letters in the string and using the #ifeq parser function to check if the substring is equal to "http". If it is, you know it's a URL, if not, you can deduce it's an on-wiki file if your parameter input is only a URL or an on-wiki file.

Sadly this depends on Wikia's willingness to install that small extension, but this should be another (wildly different) method.