for my $x ('x') { $x =~ s/x/X/ }

##</code><code>##

'x' =~ s/x/X/;

##</code><code>##

chomp;
my @line_array = split /[()\t+\s+]/;

##</code><code>##

@full = map {$_ ? $_ : ()} @line_array;

##</code><code>##

@full = grep { $_ } @line_array;

##</code><code>##

@full = grep { defined $_ and length $_ } @line_array;

##</code><code>##

@{$data[$readcounter]} = @full;

##</code><code>##

push @data, \@full;

##</code><code>##

use strict;
use Data::Dumper;

my @data;

while (<DATA>) {
	chomp;
	my @line = grep { defined $_ and length $_ } split /[()\t+\s+]/;
	push @data, \@line;
}
@data = sort { $a->[0] <=> $b->[0] } @data;

print Dumper \@data;

__DATA__
00000(IDR) 86480 22 41.435 40.696 40.728167 0 FRM 3 
00015( B ) 9312 24 45.460 43.808 42.001 409 208 FRM 0
00002( P ) 35248 24 38.568 39.327 40.641 253 53 FRM 2

##</code><code>##

use strict;
use Data::Dumper;
use Sort::Key qw(nkeysort_inplace);

my @data;

while (<DATA>) {
	chomp;
	my @line = grep { defined $_ and length $_ } split /[()\t+\s+]/;
	push @data, \@line;
}
nkeysort_inplace { $_->[0] } @data;

print Dumper \@data;

__DATA__
00000(IDR) 86480 22 41.435 40.696 40.728167 0 FRM 3 
00015( B ) 9312 24 45.460 43.808 42.001 409 208 FRM 0
00002( P ) 35248 24 38.568 39.327 40.641 253 53 FRM 2