use strict;
use Data::Dumper;

my @found = map { {ID=>$_} } qw( abC e8q xxx 11m );
my $matched = 0;

my %manager = (
    1 => {
        bob     => { members => [qw{ abc def gdF }] }
    },
    7 => {
        alice   => { members => [qw{ 5hg 8DF 9iw }] },
        charlie => { members => [qw{ 2je e8q 11M }] }
    }
);

foreach my $id (keys %manager){
   foreach my $manager (keys %{$manager{$id}}){        
       for my $i (0..$#{$manager{$id}{$manager}{'members'}}){
           my $index=0;
           foreach my $emp (@found){
               if ($emp->{'ID'}=~/$manager{$id}{$manager}{'members'}[$i]/i){
                   splice(@found, $index, 1);
                   print $emp->{'Name'} . "\n";
                   $matched++;}
               $index++;}}}}

print "Matched: ($matched) ", Dumper \@found;