It's simple: split that line wherever there is a colon or semicolon followed by space -- just to be safe, we'll accept one or more whitespace characters of any kind:

my $fontline = "font-family: Verdana, Arial, Geneva, san-serif; font-s
+ize: .69em; color: #666666";

my @components = split /[:;]\s+/, $fontline;

print join "\n", "", @components, "";

print "\n or, as a hash:\n";

%components = @components;

print "$_ => $components{$_}\n" for ( keys %components );

__OUTPUT__

font-family
Verdana, Arial, Geneva, san-serif
font-size
.69em
color
#666666

 or, as a hash:
font-family => Verdana, Arial, Geneva, san-serif
font-size => .69em
color => #666666
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