my (@hrefs) = $mech->content =~ m|COMPLETEHREF=http://www.kultus-bw.de/did_abfrage/detail.php\?id=\d+|g;

print "$_\n" foreach @hrefs;    #there are 5081 of these

#these COMPLETEHREF's can be appended to a main url like this:

my $example_url = 'http://www.kultusportal-bw.de/servlet/PB/menu/1188427/index.html?COMPLETEHREF=http://www.kultus-bw.de/did_abfrage/detail.php?id=04146900';