For that sort of application I use light weight OO. Consider:

use strict;
use warnings;

my $obj = bless {indent => '...'};

for my $suffix (qw(hello world)) {
    my $func = $obj->can("print_$suffix");
    
    next if ! $func;
    $func->($obj, " (suffix was $suffix)");
}


sub print_hello {
    my ($self, $suffix) = @_;
    
    print "$self->{indent}hello$suffix\n";
}


sub print_world {
    my ($self, $suffix) = @_;
    
    print "$self->{indent}world$suffix\n";
}
[download]

Prints:

...hello (suffix was hello)
...world (suffix was world)
[download]

There are a few subtle things going on there. If you've not used OO before notice that the object ($obj) carries along a hash reference so you can provide common information (see how 'indent' is used).

The reason the sub names have a 'print_' prefix is so that user provided names can't be used to call unintended subs.