this was done to ease the effort i would have to put in the final command generation after the hash is built.

That makes no sense. Having the same data represented in two different ways doubles the effort rather than ease it.

All non-switch parameters within mandatory braces are put in the "mandatory hash" with keys as "param1,param2....."

In the desired output you posted, mandatory has an array for value, not a hash.

"param1" is not a property of mandatory parameters, but more of a key name to identify them.

Exactly, and that's wrong. It's redundant because it's already identified by its position in the array, and it's bad to use a hash as an array.

This is how you'd ideally access the parameters: 

for my $param (@$mandatory) {
    ...
}

[download]

This is what you'd need to do if you use a hash as an array: 

sub sort_params {
   return
       map $_->[0],
       sort { $a->[1] <=> $b->[1] }
       map [ $_, /(\d+)/ ],
       @_;
}

for my $param_key (sort_params keys %$mandatory) {
    my $param = $mandatory->{$param_key};
    ...
}

[download]

For alternations , i place all the alternates in an anonymous array in the hash.

You have no way of identifying what's in the array, such as whether an element is a literal or a variable. That means you can't place all the alternates the array. You can only place the alternates that happen to be non-optional variable parameters.

In reply to Re^5: Parsing command string into a hash by ikegami
in thread Parsing command string into a hash by perlpal

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