pfSense

In 2.2.* it was possible to enter various strings into the "address" field of an alias detail line. The data would be parsed on submit and expanded out into the necessary individual IP addresses and subnets. This worked for both host and network types. The help text in 2.3 still indicates that these things are acceptable.
e.g.
172.30.1.0/24 192.168.3.4-192.168.4.1 172.50.0.0/16
would be accepted in an network alias and get expanded out into a bunch of individual subnets.

192.168.1.1-192.168.1.10
in a host alias would expand into 10 entries

192.168.1.4/30
in a host alias would expand into 4 entries - .4 .5 .6 .7

The code to parse and expand this type of entry still exists and works in 2.3. But the front-end validation is preventing the user from even entering strings like that.

Enhance the patterns for host and network address field entries so they allow these types of input.

It has been mentioned in the forum a couple of times and is easy enough to do:
https://forum.pfsense.org/index.php?topic=111361.0