Do it with URI and URI::QueryParam and you'll have code that works much more reliably and is easier to read and extend. Here's a snippet to get you going-

use URI;
use URI::QueryParam;

while ( <DATA> )
{
    chomp;
    my $uri = URI->new($_);
    next unless $uri->scheme eq 'http';
    next unless $uri->query_param;

    print $uri, $/;
    for my $param ( $uri->query_param )
    {
        printf("   %s --> %s\n", $param,
               join(", ", $uri->query_param($param))
               );
    }
}

__DATA__
http://google.com/?var1=aaaa&var2=aa
https://google.com/?var1=aaaa&var2=aa
http://google.com/
ftp://google.com/
mailto:moo@gmail.com
http://google.com/?var=one&var=two&var=three
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