I have a subroutine outputs an array like this

ATOM 1276 CB ASP B 63 52.957 58.788 67.683 1.00 44.59 C

ATOM 1280 N GLY B 64 52.075 55.496 66.522 1.00 35.29 N

ATOM 1281 CA GLY B 64 51.005 54.534 66.322 1.00 32.64 C

ATOM 1282 C GLY B 64 49.693 55.103 65.854 1.00 30.87 C

ATOM 1283 O GLY B 64 48.630 54.545 66.092 1.00 27.93 O

ATOM 1284 N LYS B 65 49.739 56.255 65.189 1.00 31.10 N

ATOM 1285 CA LYS B 65 48.527 56.912 64.720 1.00 33.91 C

ATOM 1286 C LYS B 65 48.629 57.147 63.216 1.00 32.04 C

ATOM 1287 O LYS B 65 49.675 57.571 62.721 1.00 31.87 O

here each line is an element of an array, but i need only certain columns of this output. for example the first row is all ATOM, but i do not need any of that, could anyone please tell me, how to extract the required rows, a simple psuedocode would help me a lot.

UPDATE #1

ok i used the regular expressions code that was suggested and I am facing a problem with the output, the array in the output is empty, could some one tell me where I am going wrong

the code is after i get the array from the subroutine, the array consists of the output as the format above and every line of the output is a single element of the array. If i type $line1 i get the first line. 

    my @opin = &attributes();
         
    my @lines = @opin;
    
    my ($selected, @selections);

for my $lines(@lines) {
    if ( $lines =~ /ATOM\s+    
              \d+\s+         
              ([A-Z]{1,2})\s+
              ([A-Z]{3})\s+      
              [AB]\s+             
              \d+\s+        
              \d+\.\d+\s+    
              \d+\.\d+\s+      
              \d+\.\d+\s+     
              \d+\.\d+\s+      
              \d+\.\d+\s+  
              [CNO]$/x  )  
            {
             $selected = $1 . " | " . $2 ;
            
             push @selections, $selected;
     }
}

print O "@selections";

    close (O);
    close (I);

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any help would be appreciated.

In reply to newbie need help with a simple code by perlmonk007

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