in reply to Regular Expressions in a cookie

#### splits on spaces into array
The problem is that your parameter values have spaces within e.g. "Free Trial" and no doubt "param('name')". The fact you are using $ara[4] to get the color is hinting that your @ara has 5 elements instead of 3. It would be easier to create multiple cookies: 
my $cookie1 = cookie(
    -name => 'member',
    -value => $members[$membership],
);
my $cookie2 = cookie(
    -name => 'name',
    -value => $name,
);
my $cookie3 = cookie(
    -name => 'color',
    -value => $color,
);
print header( -cookie => [ $cookie1, $cookie2, $cookie3 ] );

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Then, in membership.cgi you can retrieve each value. This will make printing your HTML easier too, as will using the quote-like operator qq|| instead of plain quotes: 
my $member = cookie('member');
my $name = cookie('name');
my $color = cookie('color');
...
print qq|<body style="background-color:$color;">|;
print qq|<h1>Welcome back, $member Member $name</h1>|;

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In your first script you might also want to check that values have been entered for each parameter.

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