Protein sequence:STARTXXXXX
Protein Sequence: XXXXXXXXX
Protein sequence: XXXXXXEND

##</code><code>##

use warnings;

my %database;
my $protein_id = "";
my $line = "";
my $datbase_filename="";
my $start=">DDB";
my $end="";
#input1: open the file containg the protein sequences.
print"Please enter the path to the fasta file of protein sequences \n";

#put the file name into $filenam
$database_filename=<STDIN>;

#remove newline
chomp($database_filename);

#open the file containing protein sequences in fasta format
open(MYFILE1,"<$database_filename") or die "Unable to open $database_filename: $!\n";

while(<MYFILE1>) 

{	#remove newline
	chomp; 
	$line=$_;
	#print "Line i: $_\n"; #test
	
		if (($line=~m/^>DDB/) and
		    ($line=~ m/to\s\d+$/))
			{
                $protein_id = $line;
				#print "protein ID: $protein_id\n";#test
			}
			
		else
			{
                $proteins{$protein_id} = $line;# associating the protein sequence in my %proteins to its  ID
				
				print "sequence: $line\n";#test
				
			}
		
}
exit;