There are several Built-in Policies included with Active Roles which leverage regular expressions (regex).
For example, the Built-in Policy - Default Rules to Validate Object Names has a number of such policies.
The policy to Validate User logon name (pre-Windows 2000) looks like the below:
As with all built-in policies, it is possible to copy and modify it in order to customize Active Roles functionality. However, changing any of these regular expressions also immediately changes the operators on all expressions from AND into OR:
It is possible to change the operators by manually editing the raw XML of the policy rule.
Waiting for a fix in a future release of Active Roles.