Hi, I am going some Cisco show output parsing and print $_ unless is doing something weird (or at least weird to me)

$_ = PID: , VID: 255, SN: AGM163923J5

my line of perl is 
print $_ unless /PID: ,/;

[download]

but the line still prints

if I use 

print $_ unless /PID: /;

[download]

the unless works correctly and the line doesn't print (but this is no good to me as it matches lines I want). Why is the addition of "," stopping it from working. Interestingly Cisco IOS CLI is doing the same

"show inv |i PID: ," doesn't match the line

is it a regex thing ??

In reply to Print unless behaving strangely by chrisayres11

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