A simple and easy to debug approach is to build your regular expression from other regular expressions that you have tested before. For example:

my $re_protocols = qr/ip|tcp|udp|object-group\s+(\w+)/;
my $re_port      = qr/eq\s+(\d+)|range\s+(\d+)\s+(\d+)|/;

my $acl = qr/access-list
             \s+
            (\w+) # name
             \s+
            (\w+) # action
             \s+
            ($re_protocols)
             \s+
            # ... and so on
            /x;
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