If you want to be clever you could make an alternating pattern from the list of dates:
my $pat = join '|', @dates;
my @files = grep /$pat/, @logfiles;
But I have no idea if that would be faster or slower than just doing a nested loop. A nested loop at least gives you the option of skipping the remainder when you've found a match.
my @files;
foreach my $file( @logfiles ) {
foreach my $date( @dates ) {
if ( $file =~ /$date/ ) {
push @files, $file;
last;
}
}
}
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