G'day doubleqq,
Here's another way to do it.
This solution only uses a single loop and pulls two elements at a time from the array (using splice).
If a pair wasn't found, the second element (if it exists) is put back on the array for retesting on the next iteration.
#!/usr/bin/env perl -l
use strict;
use warnings;
my @labsets = qw{
lab1_set1.txt lab1_set2.txt
oops___should_not_be_in_this_list.txt
lab2_set1.txt lab2_set2.txt
lab3_set2.txt
lab4_set1.txt
lab99_set1.txt lab99_set2.txt
lab100_set1.txts
lab100_set2.txt
lab101_set1.txt
lab101_set2.txts
};
while (@labsets) {
my ($set1, $set2) = splice @labsets, 0, 2;
if ($set1 =~ /^(lab\d+_set)([12])\.txt$/) {
if (! defined $set2) {
print 'NOT PAIRED: ', $set1;
}
elsif ($2 == 1 && $set2 eq $1 . '2.txt') {
print "PAIRED: $set1 and $set2";
}
else {
print 'NOT PAIRED: ', $set1;
unshift @labsets, $set2;
}
}
else {
print 'BAD FILENAME: ', $set1;
unshift @labsets, $set2 if defined $set2;
}
}
Output:
PAIRED: lab1_set1.txt and lab1_set2.txt
BAD FILENAME: oops___should_not_be_in_this_list.txt
PAIRED: lab2_set1.txt and lab2_set2.txt
NOT PAIRED: lab3_set2.txt
NOT PAIRED: lab4_set1.txt
PAIRED: lab99_set1.txt and lab99_set2.txt
BAD FILENAME: lab100_set1.txts
NOT PAIRED: lab100_set2.txt
NOT PAIRED: lab101_set1.txt
BAD FILENAME: lab101_set2.txts
Update:
Made some changes to the code and added some additional tests.
Old code (and old output) in spoiler below.
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