Looping backreferences

Joshua Goodall joshua at roughtrade.net
Wed Aug 20 21:27:18 CDT 2003

I have a simple regex for match /24 and /16 reverse lookup domains,
(it doesn't need to be more precise because the source data is validated)

which I use like this:
$net = join ".", grep { defined } reverse $zone =~ /^(\d+)\.(\d+)\.(?:(\d+)\.)?in-addr\.arpa$/;

thereby turning "1.168.192.in-addr.arpa" into "192.168.1"
and turning "168.192.in-addr.arpa" into "192.168".

Enough background.

I would like (for no other reason than shorter lines and out of curiousity)
to be able to more intuitively write
$net = join ".", reverse $zone =~ /^(?:(\d+)\.){2,3}in-addr\.arpa$/;

but of course this only returns a single backreference, not the three
I'm hoping for when I feed it "3.2.1.in-addr.arpa".

Anyone know if/how it's possible to have a variable-length list returned by 
a regex? (preferably 5.6 compat)


Joshua Goodall                                      "tea makes itself"
joshua at roughtrade.net                                       - Ana Susanj
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