Fixed handling or regular expression strings, so the regular expression functiuonality works, not just substring detection!
Added special handling if the severity marker is "ignore". Unsuprisingly, it ignores that line.
#!perl -w
use strict;
# Sorts the input, removes duplicates, and outputs it
# Read it
my @content = <>;
# Sort it, and grep to remove duplicates
my $previous = "\n\n";
@content = grep {$_ ne $previous && ($previous = $_, 1) } sort @content;
# Write it
print @content;