Count registered results based on pattern

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Tom Paine

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Jul 27, 2015, 2:32:52 PM7/27/15

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I have a collection of registered shell commands captured and would like to be able to count how many match a pattern:

- name: run a shell command to produce 'a' or 'b' on all boxes and collect the results
  run_once: true
  shell: return_a_or_b.sh
  register: shell_output_collection
  with_items: play_hosts
  delegate_to: 127.0.0.1

Think it's a matter of using a filter and then a length filter after it but I can't quite crack it:

- name: count how many are 'a'
  set_fact: count_of_a="{{ shell_output_collection.results | map(attribute='stdout') | ???match if value is 'a'??? | list | length }}"

The 'equalto' test is still in the jinja dev branch afaict and it's not even certain that that will help.