How to use greedy regexes on Curator filter?

The answer I gave at https://discuss.elastic.co/t/use-greedy-regexes-in-curator-filter/154200 is still good, though you somehow weren't able to get the results I posted there. Anchoring the end and specifying the date regex worked for me: '^xyz-us-(prod|preprod)-.*-\d{4}\.\d{2}\.\d{2}$'

I created these indices:

PUT xyz-us-prod-foo-2018.10.11PUT xyz-us-prod-foo-bar-2018.10.11PUT xyz-us-preprod-foo-2018.10.12PUT xyz-us-preprod-foo-bar-2018.10.12

And ran with this config:

---actions:  1:    action: delete_indices    filters:    - filtertype: pattern      kind: regex      value: '^xyz-us-(prod|preprod)-.*-\d{4}\.\d{2}\.\d{2}$'      exclude:    - filtertype: age      source: name      direction: older      timestring: '%Y.%m.%d'      unit: days      unit_count: 7

The results are fully matched:

2018-10-29 20:08:28,120 INFO               curator.utils           show_dry_run:928  DRY-RUN: delete_indices: xyz-us-preprod-foo-2018.10.12 with arguments: {}2018-10-29 20:08:28,120 INFO               curator.utils           show_dry_run:928  DRY-RUN: delete_indices: xyz-us-preprod-foo-bar-2018.10.12 with arguments: {}2018-10-29 20:08:28,120 INFO               curator.utils           show_dry_run:928  DRY-RUN: delete_indices: xyz-us-prod-foo-2018.10.11 with arguments: {}2018-10-29 20:08:28,120 INFO               curator.utils           show_dry_run:928  DRY-RUN: delete_indices: xyz-us-prod-foo-bar-2018.10.11 with arguments: {}

Curator's implementation of the Regex engine is using the U (Ungreedy) flag.

Ungreedy regexes make star quantifiers lazy by default, adding a "?" modifier under the Ungreedy option would turn it back to Greedy.

Try adding a '?' after the '.*' in your regex

'^xyz-us-(prod|preprod)-(.*?)-'