my $filename =  test.summary";
open (IN, "<", $filename) or die "Check the summary file. $!\n";
while (my $line = <IN>) {
    chomp $line;
    if ($line =~/^LOCUS\s+\w+\d+\s+(\d+)\sbp/) {
        $gene_length = $1;
    }
    if ($line =~/^DEFINITION\s+(.*)/s) {
        $definition = $1;
    }
    if ($line =~/^ACCESSION\s+(.*?)\s+/) {
        $accession = $1;
    }
    if ($line =~ /\s+\/db_xref="GI\:(\d+)\"/) {
        $gi_number = $1; 
    }
    if ($line =~ /\s+\/db_xref=\"GeneID\:(\d+)\"/) {
        $gene_id = $1;
    }
}

##</code><code>##

 
Data file:
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
//