I would like to understand semantics of `with_items` in ansible and compare 
this approach to `map` for example. 

For example, let consider:  

`{{ ["1","2", "3"]  | map('regex_replace', '^(.*)$', \1'some tail')  tail 

How to reach the same effect using `with_items` ? 
And in general how does it work ? Where is the body of this loop ?
For example (got from some stack overflow thread):

    - hosts: localhost
      - name: set fact 1
        set_fact: foo="[ 'zero' ]"
      - name: set fact 2
        set_fact: foo="{{ foo }} + [ 'one' ]"
      - name: set fact 3
        set_fact: foo="{{ foo }} + [ 'two', 'three' ]"
      - name: set fact 4
        set_fact: foo="{{ foo }} + [ '{{ item }}' ]"
          - four
          - five
          - six
      - debug: var=foo

To sum up, the question is about which approach is better (`map` vs 
`with_items`) and possible details of working (e.g. where  is body of this 
Each detail of working ansible is welcome!

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