Use a flag to capture the multiple lines. Remove the spaces with a regex.

my %hash=();
my $seq;
my $flag = 0;
while (<$ufh>) {
  chomp;
    
  if ( /^(AC|OS|OX|ID|GN|SQ)\s+(.*)/ ){
    print  "<$1> <$2>\n";
    $hash{$1} = $2;
    $flag = 1 if /SQ/;
  } elsif (/^K\s+/){
    $flag = 0;
  } elsif ($flag == 1){
    s/ +//g; # remove spaces
    $seq .= $_."\n"
  } 
} 
print Dumper \%hash;
print $seq;

[download]
poj

In reply to Re^3: Converting Uniprot File to a Fasta File in Perl by poj
in thread Converting Uniprot File to a Fasta File in Perl by pearllearner315

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