G'day shalgham,

Welcome to the monastery.

A representative example of both your array and file would help comprehension.

It sounds like you'll want to create a hash from your array, e.g.

my %hash = map { $_ => 1 } @array;
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Then process your file based on the hash, e.g.

while (<$filehandle>) {
    my @row_elements = split /$pattern/;
    next unless $hash{$row_elements[$i]};
    # Process "wanted" row here
}
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With more information to work with, I probably could have provided a better answer. See the guidelines in "How do I post a question effectively?": a better question gets a better answer.