I would use HTML::Parser:

#! /usr/bin/perl

use strict;
use warnings;
use HTML::Parser;

my $string = qq~.:<script>text</script> .:<script>text34</script> <div
+ class="bbcode">sammler schrieb:</div><a href="http//url.tld">test</a
+>~;
my $p = HTML::Parser->new();
$p->handler(start => \&start_handler,"tagname,attr,self");
$p->parse($string);

sub start_handler{
 return if(shift ne 'a');
 print shift->{href};
 my $self = shift;
 my $text;
 $self->handler(text => sub{$text = shift;},"dtext");
 $self->handler(end  => sub{print $text,"\n\n" if(shift eq 'a')},"tagn
+ame");
}
[download]

It's untested.