on Wed, Mar 09, 2011 at 11:00:34AM +1100, Erik de Castro Lopo wrote:
> My idea was to autogenerate the complex regexes using
> something like this:
> 
>     178.183.237.0.dsl.dynamic.eranet.pl
>     183.246.69.111.dynamic.snap.net.nz
>     188.146.109.136.nat.umts.dynamic.eranet.pl
> 
> as input.

FWIW, of 74510 patterns in the most recent Enemieslist patterns release,
9779 of them match leading four digits separated by dots (2447) or
dashes (589) or a mix of dots or dashes (the rest). You will have your
hands full coming up with groups of same.

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