Here's a simple solution with an hash of array .
There might be a better way, tho ...
use strict ;
use warnings ;
my $vec ;
my %rez ;
my $cpt = 0 ;
my $maxcpt = 0;
foreach my $item (<DATA>) {
chomp $item ;
next if $item =~ m/^}$/ ;
if ( $item =~ m/^v_(.*) {/ ) {
$vec = $1 ;
$maxcpt = $cpt if $cpt > $maxcpt ;
$cpt = 0 ;
} else {
$rez{$vec}[$cpt] = $item ;
$cpt ++ ;
}
}
foreach my $cpt (0..$maxcpt) {
foreach my $vec ( keys %rez ) {
if (defined $rez{$vec}[$cpt]) {
print $rez{$vec}[$cpt], "\t"
} else { print "\t" } ;
}
print "\n"
}
__DATA__
v_x {
x1
x2
x3
x4
x5
x6
x7
x8
}
v_y {
y1
y2
y3
y4
y5
}
v_z {
z1
z2
z3
z4
z5
z6
}