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spamassassin-users: Re: One-line URI body spam

Re: One-line URI body spam

From: Karsten Bräckelmann <guenther_at_nospam>
Date: Sun Oct 23 2011 - 00:40:56 GMT
To: users@spamassassin.apache.org

On Fri, 2011-10-21 at 11:08 -0400, Alex wrote:
> guenther, thanks for spending the time to help with this. Back to the
> books to learn more about REs.

Frankly, the RE part was not that complicated. With an exception of
the /s modifier of my solution. Your REs where not bad either. The most
important issue with your RE is hardly taught in books -- properly
anchoring your RE.

The crucial parts to the solution as outlined are (a) SA rule types,
their specifics and peculiarities, and (b) a method to develop and test
your rules, and see the match.

Thus, I suggest carefully re-reading my full explanation. Try to
understand every part of it, and play around with rules to see the
effect of each part for yourself.

-- char *t="\10pse\0r\0dtu\0.@ghno\x4e\xc8\x79\xf4\xab\x51\x8a\x10\xf4\xf4\xc4"; main(){ char h,m=h=*t++,*x=t+2*h,c,i,l=*x,s=0; for (i=0;i<l;i++){ i%8? c<<=1: (c=*++x); c&128 && (s+=h); if (!(h>>=1)||!t[s+h]){ putchar(t[s]);h=m;s=0; }}}