[] does not do what you think it does in a regexp. I would do a sub to do what you want done. 
# Zone 8 
my $z8 = "10-374,376-379,382-385,388-499,530-534,541-543,618,619,700-7
+04,707-709";

my $num = "375";
print "Found it!\n" if in_range($z8, $num); #$num =~/[$z8]/;

sub in_range{
    my $numbers = shift;
    my $num = shift;

    my @ranges = split ',', $numbers;

    foreach my $r (@ranges){
        if (my ($small, $big) = $r =~ /^(\d+)-(\d+)$/){
            return 1 if $small <= $num and $big >= $num;
        }
        elsif( my ($n) = $r =~ /^(\d+)$/){
            return 1 if $n == $num;
        }
        else{
            die 'Oh noo:-(';
        }
    }
    return 0;
}

[download]
Update: Fixed bugs

In reply to Re: Matching data against non-consecutive range by lidden
in thread Matching data against non-consecutive range by Popcorn Dave

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.