How to filter a big list

[Jérôme Rosat]

I wish to filter a list which contains approximately 300'000 lines. I  
try the "filter ... with" command. It's slow.

I try the "Repeat for each" loop but it's slower.

Is it possible to use the "filter ... with" command and to "force"  
RunRev to check only one "item" of the line and not the whole line  
with the "filterPattern" ?

Thanks.

Jerome