Creating conditions for Azure AD user queries is limited to only two options, "equals (ignoring case)" or "begins with (ignoring case)". PLEASE add more options, like is empty or null, contains, doesn't equal, doesn't begin with... Regex would also be really helpful, especially if none of the other filters options get added.
Thank you very much for posting your feedback for our review. At this time, we will not be adding this request to the near-term backlog, as we are focused on other highly requested features. However, we reevaluate requests every quarter and will reach out if priorities change. Please keep the feedback coming as it is critical for our longer-term planning.