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According to the tooltip and the code for that, the filter edit boxes accept a comma separated list of regexps:

Topic filter, comma separated list of names/regexp to include or exclude. Example: -/tf

So the regexp could have optional and required matches as well.

Doesn't seem to be documented too well, but this comment on issue 4 of the rqt_graph issue tracker has an example:

You can add filter, some sort of: -(._parameter_updates),-(._parameter_descriptions)