does anyone know a way to achieve/emulate this behavior
Perl's sprintf can refer to arguments by number, but not by name.
>perl -le"print sprintf '%2$s %1$s', qw( a b )"
b a
Double-quoted strings interpolate, so all you need
$hello = "Hello $name";
If you're asking for the format to be variable, then you're asking for a templating system. There are many of those. Here's a fair approximation of the syntax you requested:
use String::Interpolate qw( );
sub format {
my ($pat, $args) = @_;
my $t = String::Interpolate->new($args);
$t->($pat);
return "$t";
}
my $hello = format('Hello $name', { name => 'World' });
Update: Added code
Update: haoess found Text::Sprintf::Named
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