There's also RandomPage to find something by accident. MoreAboutMechanics of browsing and editing on this server. Full text search syntax Appears on every page below the content. No regular expressions but multiple words in full text search. Separate words with a space.
All words have to match.
Search is case insensitive. To exclude words prepend a '-'. Title search syntax Appears on every page next to the title, above the content. Case-insensitive PCRE regular expressions supported. Reini Urban AND the other authors of the content, whoever they may be.