In Sifmole's defense, they are equivalent in the context of the code given. Since the values within @matches are never explicitly used, it doesn't matter precisely what is in there, just how many entries there are.

This means, taking Sifmole's optimization one step further is possible: 
my $matches = grep { /^\Q$storeline|\E/ } @file;

if ($matches > 1)
{
     duped_ids($storeline);
}
elsif (!$matches)
{
     no_match($storeline);
}
return;

[download]
What I mean is that while technically they are not equivalent, in this particular sub-section of the program, they could be considered functionally equivalent.

Admittedly, as you pointed out, there might be more code, but it's not posted here.

In reply to Re^2: What does this mean by tadman
in thread Code explanation needed (was: What does this mean) by Anonymous Monk

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