Tag Filter
From within the revision graph window, the default tag filters from the settings dialog can be overridden.  If tags are set to be shown inside the revision graph nodes, then they can be filtered based on a regular expression.  The filter can be either to include or exclude the tags that match the filter based on the show/hide toggle.  For proper regular expression syntax, see http://java.sun.com/javase/6/docs/api/java/util/regex/Pattern.html
Tag Filter