thank you guys. total misunderstanding on my part
works perfectly now

use warnings;
use strict;

my @dic = qw#beriberi hanabbsbbshana#;

for (@dic) {
   my $pat = $_;
   print "trying to match $pat\n";
   print "matched $pat\n" if $_ =~ m#^(hana)(bbs)?(?(1)\2\1|\1)$#;
}

my @pat = qw#AAAAG AC GC AZG ZC AAAG#;

for ( @pat ) {
   my $pat2 = $_;
   print "matching $pat2\n";
   print "matched $pat2\n" if $_ =~ m#[ATGC]+(?(?<=AA)G|C)$#;
}
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