tv_grep and multiple ids

Hello all,

I'm trying to pass to tv_grep multiple channel-ids but can't figure out 
how do it.
Basically I would need to pick 8 channel-ids from my input file.

using: tv_grep --output out.xml --channel-id DMAX.ch in.xml
works pretty fine, but how to extract more ids in just one time? Do I 
need to use a regexp?

Thanks.

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