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  1. or download this
    use strict;                                                           
    +          
    use warnings;                                                         
    +          
    ...
            "no matches for $cust\n";
        }
    }
    
  2. or download this
    $ perl /tmp/kk.pl 
    Useless use of string in void context at /tmp/kk.pl line 38.
    ...
    customer2 matches:     test@customer2.service
    customer4 matches:     test@customer4.service
    customer5 matches:     test@customer5.service