This is a custom search engine that runs on the page source. To make a search, first select the J wiki search page from the sidebar.
Unlike the standard MediaWiki search engine, there is no special treatment for common words or code fragments, except only where appropriate in a regex search.
For example, you can search for "each" or "/:", whereas in the usual MediaWiki search, neither would return any results.
The default search is case insensitive.
The regex search uses pcre. For example, a regex search for "^Six" will find lines beginning "Six".