Your main problem is that you need to split the line you're passing to ban() 

    m|/sorry/| && ban(split ' ', $_);

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With that input, your above three lines would start to make some sense.

Thing is that, in contrast to command line arguments, a string you pass as one parameter to a subroutine is not automatically split.  I.e., when you say on the command line 

# ./script.pl foo bar baz

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you get the three words "foo", "bar", "baz" as separate elements in the array @ARGV (which I suppose you were using in the working command line version in place of @_). This is because the shell splits the command line on whitespace, before the arguments are placed in @ARGV.

OTOH, when you pass "foo bar baz" as a single string to a subroutine, it is left as is, so the array @_ holds one element, which is the entire string.  In other words, after your grep for /proxy_/, you still have the entire string in @cutoff — and the rest of the code stops working...

That said, you could also leave your ban($_) call as is, and simply extract the relevant part of the string with a regex capture: 

sub ban {
    my $line = shift;
    ...

    my ($proxy) = $line =~ m| - \S+/(proxy_\S+)|;
    my @cutoff = grep /$proxy/, @cfg;
    ...

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In reply to Re^7: Real time log parser by Eliya
in thread Real time log parser by kazak

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