This way all the six-letter strings are pushed onto @array. 
#!/usr/bin/perl -w
use strict;
use warnings;
use Data::Dumper;

my @array;

while ((my $name = <DATA>))
{
  my @t = split(/\./, $name);

  my $string = join('', map(chr, @t[15 .. @t-2]));
  push @array, $string;
}

print Dumper( \@array ) . "\n";

__DATA__
iso.3.6.1.4.1.9.9.392.1.3.21.1.2.6.100.97.110.115.117.101.18481153 = S
+TRING:
iso.3.6.1.4.1.9.9.392.1.3.21.1.2.6.100.97.110.115.117.101.18481154 = S
+TRING:
iso.3.6.1.4.1.9.9.392.1.3.21.1.2.6.100.97.110.115.117.101.18481155 = S
+TRING:
iso.3.6.1.4.1.9.9.392.1.3.21.1.2.6.100.97.119.110.105.103.18468865 = S
+TRING:
iso.3.6.1.4.1.9.9.392.1.3.21.1.2.6.100.97.119.110.105.103.18468866 = S
+TRING:
iso.3.6.1.4.1.9.9.392.1.3.21.1.2.6.103.105.108.98.111.105.18460673 = S
+TRING:
iso.3.6.1.4.1.9.9.392.1.3.21.1.2.6.103.105.108.98.111.105.18460674 = S
+TRING:
iso.3.6.1.4.1.9.9.392.1.3.21.1.2.6.103.105.108.98.111.105.18460675 = S
+TRING:
iso.3.6.1.4.1.9.9.392.1.3.21.1.2.6.106.101.114.116.114.97.18366465 = S
+TRING:
iso.3.6.1.4.1.9.9.392.1.3.21.1.2.6.106.101.114.116.114.97.18366466 = S
+TRING:
iso.3.6.1.4.1.9.9.392.1.3.21.1.2.6.106.101.114.116.114.97.18366467 = S
+TRING:
iso.3.6.1.4.1.9.9.392.1.3.21.1.2.6.106.111.97.104.117.114.18477057 = S
+TRING:
iso.3.6.1.4.1.9.9.392.1.3.21.1.2.6.106.111.97.104.117.114.18477058 = S
+TRING:
iso.3.6.1.4.1.9.9.392.1.3.21.1.2.6.106.111.97.104.117.114.18477059 = S
+TRING:
iso.3.6.1.4.1.9.9.392.1.3.21.1.2.6.106.117.100.110.111.114.18505729 = 
+STRING:
iso.3.6.1.4.1.9.9.392.1.3.21.1.2.6.106.117.100.110.111.114.18505730 = 
+STRING:
iso.3.6.1.4.1.9.9.392.1.3.21.1.2.6.106.117.100.110.111.114.18505731 = 
+STRING:
iso.3.6.1.4.1.9.9.392.1.3.21.1.2.6.115.116.101.104.111.112.18489345 = 
+STRING:
iso.3.6.1.4.1.9.9.392.1.3.21.1.2.6.115.116.101.104.111.112.18489346 = 
+STRING:
iso.3.6.1.4.1.9.9.392.1.3.21.1.2.6.115.116.101.104.111.112.18489347 = 
+STRING:
iso.3.6.1.4.1.9.9.392.1.3.21.1.2.6.119.97.108.97.100.108.18452481 = ST
+RING:
iso.3.6.1.4.1.9.9.392.1.3.21.1.2.6.119.97.108.97.100.108.18452482 = ST
+RING:
iso.3.6.1.4.1.9.9.392.1.3.21.1.2.6.119.97.108.97.100.108.18452483 = ST
+RING:

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In reply to Re^3: Lines of single character to array by pme
in thread Lines of single character to array by ALykke

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