Matthew Cline writes:

> I can't find '$&' in any of the Net::DNS version 1.14 files.  Was it present 
> before this version, or added after it?  Maybe we could include a special 
> version of Net:DNS without the $& to make SA faster.

As nearly as I can tell these are the perl modules on my system that are
used by SA and include $&, $', or $`.

  spamassassin/lib/Mail/SpamAssassin/PerMsgStatus.pm
  /usr/share/perl/5.6.1/Exporter/Heavy.pm
  /usr/share/perl5/Net/DNS/RR.pm
  /usr/share/perl5/Net/DNS/RR/ISDN.pm

DNS.pm has $VERSION = "0.19";
Exporter.pm has $VERSION = '5.562';

I wish the perlre manual page was more specific about the exact behavior
of the performance penalty.

Dan

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