As a note, there's a way to check for "lines which are composed only of spaces" that I find much more succinct:
print "Query: $line" if ($line =~ /\S/);
Or more generically: 
next unless ($line =~ /\S/);
print "Query: $line";

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"Not composed entirely of spaces" is equivalent to "contains a non-space character", at least in this context.

In reply to Re^2: Record Separator affecting Regex by tadman
in thread Record Separator affecting Regex by Kozz

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