Urchin is capable of sophisticated filtering of any text-based report via the reporting interface. To filter in or out any text string, enter it into the Filter box and click the "+" (include) or "-" (exclude) button. The Urchin reporting system will re-query the database and only display corresponding results.
To conduct more complex filtering operations, POSIX regular expressions can be used (POSIX is a standard for text manipulation which is beyond the scope of this guide).