my %EMail = (
    Category1 => { "Name One",   'some1@address.com', },
    Category2 => { "Name Two",   'some2@address.com', 
                   "Name Three", 'some3@address.com', },
    Category3 => { "Name Four",  'some4@address.com',
                   "Name Five",  'some5@address.com', 
                   "Name Six",   'some6@address.com',
                   "Name Seven", 'some7@address.com', 
                   "Name Eight", 'some8@address.com', },
);
@EMail{keys %{$EMail{$_}}}= values %{$EMail{$_}}  for keys %EMail;

sub GetEMailFor
{
    my @addresses= ();
    for my $dest (@_) {
        my $addr= $EMail{$dest}
          or  die "No such e-mail destination: $dest\n";
        push @addresses, ref($addr) ? values %$addr : $addr;
    }
    return join ',', reverse @addresses;
}

[download]

Read for apprehension; it hasn't been tested. (:

Actually it has; it had lots of typos. ): But I fixed them.

        - tye (but my friends call me "Tye")

In reply to Re: Complex Hash by tye
in thread Complex Hash by Adam

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.