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  1. or download this
    use strict;
use warnings;
...
attempt 2 yields: d
attempt 3 yields: aAcd
attempt 4 yields: aAcd
  2. or download this
    URL: 
    domain: 
        match: http://(\w+)\.(\w+)\.
        replace: $2
  3. or download this
    apply s/http://(\w+)\.(\w+)\./$2/ to 'URL' to produce 'domain'