G'day perlpoda,

Welcome to the monastery.

Without any code or data, you're only going to get vague responses. Follow these guidelines for a better answer: How do I post a question effectively?

Here's a basic technique that does the sort of thing you appear to want:

$ perl -Mstrict -Mwarnings -E '
my @identified_bad_links = (qw{a c e});
my %bad_link = map { $_ => 1 } @identified_bad_links;
my @all_links = (qw{a b c d e f g});
say $_ for grep { ! $bad_link{$_} } @all_links;
'
b
d
f
g
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