use strict;
use warnings;

my @records = {};
$/ = "\n//";

while (defined(my $rec = <DATA>)) {
    my %fields = $rec =~ /^(?:(?! {10}) *(\S{1,10}))?  (.*?(?=\n(?! {10})|\Z))/gms;
    
    $fields{$_} = [map {s/^\s*//; $_} split "\n", $fields{$_}] for keys %fields;
    push @records, \%fields;
}

for my $record (@records) {
    print "$_:\n", map{"   $_\n"} @{$record->{$_}} for sort keys %$record;
    print "\n\n";
}


__DATA__
LOCUS       NM_001098210
DEFINITION  Homo sapiens catenin 
ACCESSION   NM_001098210
VERSION     NM_001098210.1
KEYWORDS    RefSeq.
SOURCE      Homo sapiens (human)
  ORGANISM  Homo sapiens
     CDS             269..2614
                     /gene="CTNNB2"
//
LOCUS       NM_001098209            3415 bp    mRNA    linear   PRI 27-APR-2014
DEFINITION  Homo sapiens catenin (cadherin-associated protein), beta 1, 88kDa
            (CTNNB1), transcript variant 2, mRNA.
ACCESSION   NM_001098209 XM_001133660 XM_001133664 XM_001133673 XM_001133675
VERSION     NM_001098209.1  GI:148233337
KEYWORDS    RefSeq.
SOURCE      Homo sapiens (human)
  ORGANISM  Homo sapiens
            Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi;
            Mammalia; Eutheria; Euarchontoglires; Primates; Haplorrhini;
            Catarrhini; Hominidae; Homo.
     CDS             269..2614
                     /gene="CTNNB1"
                     /gene_synonym="armadillo; CTNNB; MRD19"
                     /codon_start=1
                     /product="catenin beta-1"
                     /protein_id="NP_001091679.1"
                     /db_xref="GI:148233338"
                     /db_xref="CCDS:CCDS2694.1"
                     /db_xref="GeneID:1499"
                     /db_xref="HGNC:HGNC:2514"
                     /db_xref="MIM:116806"
                     /translation="MATQADLMELDMAMEPDRKAAVSHWQQQSYLDSGIHSGATTTAP
                     SLSGKGNPEEEDVDTSQVLYEWEQGFSQSFTQEQVADIDGQYAMTRAQRVRAAMFPET
                     LDEGMQIPSTQFDAAHPTNVQRLAEPSQMLKHAVVNLINYQDDAELATRAIPELTKLL
//