Actually, they kinda do the same thing, except that the map block returns the last expression evaluated, which is what is being gathered to make the output value.

If I follow your quest, you are looking to take @session_keys and grab any entry that contains the taxman string, but only the part after the taxman string. I think this is closer: 

my @sub_locs = map {
  /taxman.add.subloc.(.*)/ ? $1 : ()
} @session_keys;

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If the regex matches, then $1 is added to the output list. If the regex doesn't match, then an empty list is added, which means the item is essentially ignored.

-- Randal L. Schwartz, Perl hacker

In reply to Re: Using map by merlyn
in thread Using map by blackjudas

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