User Problem

Currently, Trello automation has limited support for regex, but it is not fully or officially supported. For example, if a user wants to get the last 6 characters of a string from a card name using: "When the name of a card contains...." (regex below) and set the custom field's value to a wildcard:

It does not pull the last 6 characters.

Suggested Solutions

Add full regex support, or even add UI elements to support partial find / filtering.

Current Workarounds

Some regex works in Trello automation, but it's not fully supported. So, it may be possible to make use of some regex - but the experience is not consistent.