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  1. or download this
    $server_name =~ m{
        \A                   # start of string
    ...
        \.                   # a literal period
        product1help\.com    # literal 'product1help.com'
    }xms;
    
  2. or download this
    $server_name =~ m{
        \A                   # start of string
    ...
        product1help\.com    # literal 'product1help.com'
    }xms;
    my $prefix = $1;