lab1_set1.txt
lab1_set2.txt
lab2_set1.txt
lab2_set2.txt
lab3_set2.txt
.....
labn.set1.txt
labn_set2.txt 

##</code><code>##

 
for (@labsets) {
	if ($_ ~= /^lab\d{1}/) = [some condition] {
 		print "$_ matched\n!"
 	} else {
 		print "print $_ did not match\n";
 	}