while(<>) {
    chomp;
    if ( /set\spolicy\sid\s(\d+)\s(from|name\s\"[^"]+\")?\sfrom/ ) { $id = $1; push ( @{ $id_policy{$id}}, $_ ); next; }
    push ( @{$id_policy{$id}}, $_ ) if $id
}

for my $id ( keys %id_policy ) {
    foreach (@{ $id_policy{$id} }) {
        if ( /set\spolicy\sid\s(\d+)\s(from|name\s\"[^"]+\"\sfrom)\s\"Untrust\"\sto\s"DMZ/ ) { 
            # ?????????
        }
    }
}

##</code><code>##

input 

set policy id 155 from "Trust" to "Untrust"  "**** Users" "Safe Boot Servers" "ANY" nat src permit 
set policy id 155
exit

set policy id 150 from "DMZ" to "Untrust"  "**** Zone1" "Postini" "SMTP" nat src permit log 
set policy id 150
set src-address "**** Zone2"
set src-address "***** Farm Servers"
set src-address "**** Zones"
set log session-init
exit
set policy id 154 from "Trust" to "DMZ"  "*** - **** DB" "****" "Oracle - 1521" permit 
set policy id 154
exit
set policy id 157 from "Untrust" to "Trust"  "Postini" "MIP(194.82.***.***)" "SMTP" permit 
set policy id 157
exit
set policy id 162 from "DMZ" to "Trust"  "*****" "****_DEV Database server" "HTTP" permit 
set policy id 162
exit
set policy id 163 name "mail-relay.**** => OUTBOUND" from "Trust" to "Untrust"  "Mail-Relay" "Postini" "SMTP" nat src dip-id 5 permit 
set policy id 163
exit

##</code><code>##

set policy id 148 from "Untrust" to "DMZ"  "Any" "MIP(194.82.***.180)" "HTTP" permit 
set policy id 148 application "HTTP"
set policy id 148
exit