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/
    ((?:src\s|dst\s|translated\s)?\S+)
...
    (")?
    ((?:(?(2)[^"]|\S)(?!\S+=))+)
/xmg;

use warnings;
use strict;
...

messages:Dec 17 09:41:08 10.14.93.7 ns5xp: NetScreen device_id=ns5xp  
+system-notification-00257(traffic): start_time="2002-12-17 09:45:59" 
+duration=4 policy_id=0 service=tcp/port:8000 proto
=6 src zone=Trust dst zone=Untrust action=Permit sent=722 rcvd=520 src
+=10.14.94.221 dst=10.14.90.217 src_port=1060 dst_port=8000 translated
+ ip=10.14.93.7 port=1224