i would do it like this...

while (<DATA>) {
        next unless index '%SEC-6-IPACCESSLOG', $_;
        @f = split /(?:[:,]*\s+:?|\/)/;
        print join($/, @f), $/;
}

__DATA__
Aug 22 11:46:27 masterudp003210uds.netops.msnyuhealth.org 148526: Aug 
+22 15:46:26 UTC: %SEC-6-IPACCESSLOGDP: list 101 denied icmp 10.4.12.2
+ 53 -> 10.7.151.48 :8/0:, 1 packet
[download]

$ perl log.pl 
Aug
22
11:46:27
masterudp003210uds.netops.msnyuhealth.org
148526
Aug
22
15:46:26
UTC
%SEC-6-IPACCESSLOGDP
list
101
denied
icmp
10.4.12.2
53
->
10.7.151.48
8
0
1
packet

inserting various checks on the fields after splice or shifting off of the front (probably a switch of some sort on the %PROCESS doing the logging)

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