Just for fun, this version detects which of the two files is actually missing:
use strict;
use warnings;
my %file;
while(<DATA>) {
chomp;
if( !/^lab(\d+)_set(\d+)\.txt/ ) {
warn "$_ doesn't belong here!";
next;
}
$file{$1} += $2;
}
for( keys %file ) {
print
"lab$_ ",
$file{$_} == 3
? 'matched'
: "is missing lab${_}_set" . ( 3 - $file{$_} ) . ".txt",
"\n";
}
__DATA__
lab1_set1.txt
lab1_set2.txt
lab2_set1.txt
lab2_set2.txt
lab3_set2.txt
lab100_set1.txt
lab100_set2.txt
...produces...
lab1 matched
lab3 is missing lab3_set1.txt
lab100 matched
lab2 matched
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