That's why String::Interpolate exists: 
#!/usr/bin/perl
use warnings;
use strict;

use String::Interpolate;

my @a;
my $proto = 'String::Interpolate'->new({'a' => \@a});

@a = (1, 2);
print  $proto->('@a 3 4');  # 1 2 3 4

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map{substr$_->[0],$_->[1]||0,1}[\*||{},3],[[]],[ref qr-1,-,-1],[{}],[sub{}^*ARGV,3]

In reply to Re: set proto string by choroba
in thread set proto string by vincentaxhe

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