# read required ids into an array
my @reqids = <REQIDS_FILE>;
chomp @reqids;

# build regex containing all required ids
my $re = join '|', map { "\Q$_\E" } @reqids;
$re = qr/$re/;

# Process infile a line at a time looking for matches
while (<INFILE>) {
  if (/$re/) {
    print "Matched - $_";

    if (/SELECT/) {
      for (1 .. 3) {
        print scalar <IN_FILE>;
      }
    }
  }
}