dfilter functions

[Dario Lombardo <lomato () gmail com>]

Hi
I've noticed that the online documentation about dfilter functions just
talks about 2 of them, upper and lower:

https://www.wireshark.org/docs/man-pages/wireshark-filter.html

but there are more that are undocumented AFAICS:

- len
- size
- count

Can someone explain me their purpose and give a working example on some
protocol?
Thanks.
Dario.

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