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#!/usr/bin/env perl -l

...
        unshift @labsets, $set2 if defined $set2;
    } 
}

PAIRED: lab1_set1.txt and lab1_set2.txt
BAD FILENAME: oops___should_not_be_in_this_list.txt
...
NOT PAIRED: lab100_set2.txt
NOT PAIRED: lab101_set1.txt
BAD FILENAME: lab101_set2.txts

#!/usr/bin/env perl -l

...
        unshift @labsets, $set2;
    } 
}

PAIRED: lab1_set1.txt and lab1_set2.txt
BAD FILENAME: oops___should_not_be_in_this_list.txt
...
NOT PAIRED: lab4_set1.txt
PAIRED: lab99_set1.txt and lab99_set2.txt
NOT PAIRED: lab100_set1.txt