Re: Help - How to unwind an SRS address?

On Sat, 20 Nov 2004, Chris Drake wrote:

> Hi,
> 
> Please can someone give me a regex or *simple* instructions on how to
> reconstruct the real senders email address from an SRS one (pref
> without installing anything)?

I haven't checked this. And I did put a few extra (?:) constructs in to 
clarify the blocks. I used [^=]+ to match each section.

s/^SRS0[-+=](?:[^=]+)=(?:[^=]+)=([^=]+)=([^@]+)@/$2@$1/
            HH0       T0         domain   user
s/^SRS1[-+=](?:[^=]+)=(?:[^=]+)=(?:[^=]+)=[-+=](?:[^=]+)=(?:[^=]+)=([^=]+)=([^@]+)@/$2@$1/
            HH1       T1        fwdomain

SRS addresses are those matching ^SRS[01][-+=] as noted by Mark.

S.

-- 
Shevek                                    http://www.anarres.org/
Robust Sender Policy Framework (SPF)      http://www.libspf2.org/
SRS for the next generation               http://www.libsrs2.org/